Urgent request for builder recommendations

[Arianna1]

Hi everyone, we've just bought a house in Putney and planning to do refurbishment. The amount of work is not huge but there's quite a bit to do: get rid of a couple of partition walls; re-plumbing and re-wiring; installing underfloor heating; re-painting, and few minor things.
We have had a few builders coming but they are either a one man band and hence unreliable, or too big companies which charge too much.
I was wondering if anyone could recommend builder firms who are, i suppose, medium size, tried and tested, have a head man to oversee everything, and importantly don't cost the earth.
Will be very grateful for the contacts.
thank you!