Your works has probably already started, but this is more for others reading this thread later on!
I can recommend Riga Interiors - I've used them twice for a 2 bedroom flat and also a 5 bedroom house.
Not for big structural works (e.g. extensions, etc) but small structural works (knocking through walls) and general renovation, bathroom revamp, etc.
I found the crew did a good job, on time, and also the quotes were competitive.
The one weakness though is Design and Advice - you need to go into the project knowing what you want rather than rely on them for design guidance, and also you need to know what materials/fittings you want.