In reply to bone:
I was going to say speak to the reception and they may be able to overturn it
I used to work at the foundry and parking was a nightmare with the neighbouring flats taking up our spaces. The parking company is there to maximise our chances (as users for the climbing wall) of parking, especially important now that the road is P&D, although nothing will help with the fact it's too small at peak times.
We all hate these parking charge notices, but it's pretty much the only way to prevent 'neighbours' and from taking the piss and using your land so you (and your customers) can't access it.