Looking for Drainage Companies in Bristol BS22?

Land Drainage
Project Location: Bristol BS22

> Area (in sq ft): 15 X 20  

> Job description: I have flooding in the back garden, it is right against the house, when it rains. I believe the garden height was dropped and it is now too low. I would like advice & suggestions for the best way of draining this area. 

> Job start date: Less than two months 

> The client is looking for: To get quotes and a contractor to do the work