I sourced some engineered oak from UK Flooring Direct in Leicestershire for my place in SE18. Price was very keen and delivery/service reliable. I went for a rustic/knotty flooring which might not be to everyone’s taste but they seem to stock a big range. I understand that most engineered flooring is supposed to be suitable for UFH- but personally I have to say if I was going with that type of heating I’d be seriously thinking about porcelain parquet effect tiles.