Further to what Carrie's mom said about deposits - any landlord whether private or through an agent must now register a deposit with one of 3 government approved schemes - doesn't matter who they are, they are not exempt and its a good thing cause it stops tenants getting screwed over by dodgy landlords.
Em- try environmental health at your local council - they will ask you to keep a log of all the noise but they can do things - it does take time. Don't blame you though ofor wanting to get away and I think I'd be tempted to call social services too with that sort of behaviour!
As a starting point you could try looking here - www.rightmove.co.uk and you can search by postcode or area to find whats available in your area - I don't think private landlords are on there but you'll probably get all your local agents which is a good start
Give me a shout if you need any help