You have a lot of leeway for wear and tear!! More than most landlords can imagine
Also I'm pretty sure wear and tear tailored to occupants so what a single person and a famly of 6 are allowed are completely different
Shelter have some useful info (and a helpline open until midnight I believe), take photos of everything look for photos showing how preperty was. If a tiny spot which is not noticable consider touching up (check inventory to make sure you're not touching up his favourite belmish)
If in doubt small claims court/moneyclaims online, they are VERY sympathetic to the tennant and recognise the days of landlords viewing deposit as fund for renovations are long gone.
(Obviously no mumsnetter is like this!)
The scheme lala is referring to came in recently, landlords have to put deposit in a scheme (funded via the interest on the deposits or a separate insurance policy) but it's not retrospective.
FWIW we left a very damp property and got our whole deposit back however landlord should never have let it to us they knew about the damp, MAJOR problem in the block, we told them about it several times, didn't however get money to compensate us for damaged clothes (wonders off thinking will insurance cover it?....)
Good luck