Hi - I had the company round - gentleman seemed to know what he was talking about. I will use him ( you can see his prices on his website) in about four weeks and I will let you know what I think after the work is completed if that helps
I used that company based in Balham. I found them dishonest! They quoted me for using a special varnish " Junkers" if I remember correctly. Unfortunately, I had read the brochure about Junkers products. The drying time was much longer than what they did in my flat.I even called the Junkers sales rep who confirmed what I had read. When I confronted them, I asked to see the Junkers jars or bottles. Apparently, they transfered the product in different bottles in the morning. I did not pay the rest of the money (about £500 out of £1400). it has been 4 years and they never claimed it back. I also complained to consumer association about them.
If you are using them, stay at home and check everything. I was very disappointed as I used to live in Clapham South and had heard about this company prior to moving to SE1.