Does anyone know what are the best websites to use to find really cheap places to rent, or know where the cheapest areas are to look. Im dont looking for anything fancy, just a place with 3-4 bedrooms, and is 1500 or lower pcm, could even be an ex druggy house idc i just need somewhere to live.

That simply doesn't exist in London.

You could get a 1-2 bed flat in London for that kind of budget, if you looked far enough out.

Take a look on RightMove for a realistic guide to rental prices.

3-4 bedrooms, ￡1500 a month - you'll find that in Peterborough, never in London

1500 is enough for 3 bedroom in Upton park,Barking,Harlow and may places. On web site they will offer you more than 1500 in order to charge high commission.

You are looking for something that doesn't exist, so you need to up your budget or lower your expectations or both