We found PG Estates after a terrible ordeal of our flat falling through last minute with another agency (David St James who I would profusely not recommend., they still havent paid our money back it's been three weeks..).
Victoria at PG estates was aware of the last minute situation and within the same day of viewing we had already put in an offer and Victoria had managed to approve this with the landlord even though he was not in the country. Usually it takes agents a few days to contact the landlord and hear back, however it seems that PG Estates have a good rapport with their landlords and are able to contact them pretty quick.
We had the contract signed within 24hours - they only take a £200 agency fee for referencing so it is safe to say they are definately the cheapest! it is £200 as a flat fee so half the price of everyone else on the market - no additional charges.
Moreover we needed a few things in the flat, they have these handymen which are flexible and proffessional and things are fixed pretty quickly - I hadn't even noticed they had been and gone!
Great service, very proffessional and amiable people, it was a relief to be dealing with an agency like this for the rest of the year, the lettings market is getting more and more competitive; the service that these guys provide remind me of the old days where you didnt have to throw obscene amounts of money at agent to find a home.