That is true... I'm sure they're cool with having people pose with them for photos and such - they're part of one of the country's biggest tourist attractions, after all - but they must get tired of the few people who use it as an excuse to act like dicks. Really, it's pretty much the same as any big city anywhere in the world, act however you normally would in everyday human society.Cheery Lunatic said:-How NOT to act in London (is it true the Palace guards don't react to anything you do to them?)
As for stuff to do: Oxford Street is pretty reliable for clothes and stuff, but it's a bloody long street so walking the whole length might not be ideal... starting around Oxford Circus station and walking down towards Bond Street (it's well signposted, otherwise just ask someone) is probably the best plan. There's a big HMV store right opposite Bond Street station that's good for music and games and such.
Can't really help with restaurants unless you want McDonalds... in which case there's one about every 250 yards, y'can't avoid them. I can't really help with the touristy sort of things either, if I'm honest - as I was living there and so not a tourist, it never really felt necessary to go and do it, y'know?