UKC

There is a car on Italian plates with flat tyres that is gathering moss, that's been parked directly outside our house in Sheffield for a long time. 

What can be done about it?  

You could push it in front of someone else's house

https://www.sheffield.gov.uk/home/pollution-nuisance/abandoned-untaxed-vehi...

Is it a Maserati ghibli???

I think it's my Chiron...

Plant a tree in it?

Expanding on a thread about abandoned bikes a few weeks ago I'd say go Wombling !  

Of course under the cover of darkness. 

Ring the council.

You have a Knack for this sort of thing

If it was causing an obstruction in the road and the police were informed, they would come and take it away very quickly.

How it becomes an obstruction is the issue (cough trolley jack cough cough)  : ) 

Well done! Have a like.

As per artif.  Do not under any circumstances report it whilst it is not quite an obstruction as they will just wait for the owner to turn up.  Dark night, and jack it up and drag into street.

After removing anything of value. I assume it's not been stripped yet.

That would be theft.  I wouldn’t suggest stealing anything, just blocking the road and reporting it the next morning.

Is that a wee drink before a meal?

If it's reasonably intact and kinda-sorta legally parked, I don't think Sheff City Council will do anything about it. 

I spoke to them about a car that had been left in the same spot for several months last year - tax and mot had expired, the upholstery and the steering wheel had gone impressively mouldy, but they weren't interesting in classing it as 'abandoned' unless it was burnt out, the windows were smashed or something like that.  (Unfortunately, I didn't have the presence of mind to ask if they were suggesting a course of action I could take.)

....and blocking the road isn't an offence?

In both cases the important thing to ensure is not getting caught.

Could you check on DVLA to see if it's taxd and MOT'd. If it's not, reporting it through there may get someone to look at it

Is there anything that might be considered to be a "suspicious package" in it?

Al

It's got Italian plates, so it's probably Mafia and has got a body in the boot.

In the olden days you just let Italian cars rust away.  About 2 weeks.

Section 99 Road Traffic Regulations Act 1984

The removal of Abandoned Vehicles.

https://www.legislation.gov.uk/ukpga/1984/27/section/99

If you can prove its been there, your word should be enough then get it removed by the 5-0 or council.

It's perfectly legally parked. Obvs not UK taxed as it's on Italian plates. It just hasn't moved for a long time and looks completely knackered and is an eyesore.

At least it's not a massive van I suppose, but there is a side road where nobody really parks and where there are no front doors where it could rust out the rest of its days and nobody would mind...

However, I'd be pretty pissed if I had parked my rusty camper (if I had one) outside someone's house in Italy only for it to be removed because it looked abandoned...

Yes, I know what you mean, I have little sympathy with people who feel like they own the street outside their house, they are only a short step away from those you read about leaving passive-aggressive notes on ambulance windscreens - but there does come a time when it seems like taking the piss. 

The car I reported was also not really that much of a problem, just irritating.  It was taking up more space than it needed to, and parking is at a bit of a premium here as in so many streets these days.  In the end it just went away one day while I was at work, I don't know but imagine the owner either managed to get it going or had it taken away for scrap.

Tricky.  I was nowhere near ready to try any of the sort of erm..  'direct action' that's been suggested here, but there might have come a time, so after I reported it and got nowhere it did occur to me that perhaps I shouldn't have bothered.  Mind you, it would be just my luck to try something tricky with a trolley jack and end up getting arrested!

Your big mistake is to advertise publicly that you'd like to do something about it. 

Now there's not much you can do about it. Apart from bleat to the council.

I'd have said nothing and just have towed it a few hundred yards down the road and abandoned it in the carriageway. Fait accompli.

Not a mistake - I don't want to be sneaky about or make any trouble.

Big mistake to take anything Num Num says seriously!

You could strip it for parts and sell them on ebay.

Alternatively, are there any travellers in the area looking for a bit of scrap metal?

That's not fair - he said something serious recently. About Brexit I think...

What? Totally out of character, was he ill?

Not making a useful reply to your OP but just a general comment

A few years a car died on me (dual-mass flywheel) and I was towed home. My usual on-street parking spot was unavailable so we had to dump it on a nearby street. I had intended to put a note in the windscreen and knock on a few doors to explain the situation and say that I'll get it sorted ASAP, but life got in the way. Within 3.5 days, both front tyres had been let down. I instantly reported this to the police simply as I was concerned that my alloy wheels might be damaged by having the weight of my engine pressing down on them with no cushioning. The police advised me to put a notice saying "Police Aware" with a "crime number" on it, in the windscreen. I did this. 
A day later I arranged for a friend to come and help me sort it with a compressor and a tow. 
We couldn't inflate the tyres. Not only had they been let down, but the valve cores had been removed.
I got chatting to a young man who was pottering around in the garden of the house in front of which my car was parked/dumped.

To cut a long story short, it was blindingly obvious that he was the boyfriend of the daughter of the NIMBY old geezer in that house who had let down my tyres and taken out the valve cores, and they had got in a massive panic over a misunderstanding of what "Police Aware" meant. 

Why was it obvious that they had removed the valve cores? Because AS A FRIENDLY GESTURE he offered me some valve cores that were in his pocket....

(other things in the totally amicable conversation acted as a confession. My car was parked totally legally)

Well, you shouldn't drive around in a car covered with moss growing all over it

It WAS an MG

Must've been a yellow one, they wouldn't have noticed on a British racing green.

Fake MG.

ZTt ie Rover 75 made by BMW with a reversed engine and a a gear train made of suet