Lovely layout, in the UK there is still a thriving community for TT/3mm modelling and indeed we have a 3mm section in the special forums here which covers all forms of TT and 3mm/ft modelling.
While the only modern RTR is continental, the range of kit's is HUGE, easily as big as most other scales. Definitely a viable option for the UK as well as continental.
Lovely example of modelling though, what track did you use? I know Tilling do a range, in the UK most people either hand build (with or without Society flexi track bases), use 3SMR, or Peco HoM.