In reply to Lynsety:
> The 'schwalbe-g-one' look interesting! The marathon plus are on my husband's bike and have so far served him well.
> Do you need any thing special to go 'tubeless'?
Yes, the right type of rims and tubeless conversion kit. It is not the easiest thing to do (recently changed my MTB to tubeless) but worth it for mountainbiking.
For commuting I've long been a big fan of Marathon Pluses - my first pair did maybe 10,000 kms over lots of years including riding a lot of gravel paths where I used to live - not one puncture. I'm on the second pair now, I went down from 35 to 32 mm, although I'm not sure it makes much difference. I also have Marathon Winter - the ones with studs, but that's a bit specialist, have used them for about three days since moving back to the UK three years ago, and then Marathon Plus Tours - they are 35 mm and have more tread on them - I mainly ride that bike on road now, but used to ride it a lot on gravel and like the slightly wider and grippier version.