Just looking around ebay today I stumbled on this, apparently a Hornby, kit built Scotrail class 156. http://www.ebay.co.uk/itm/Hornby-R2693-KIT-BUILT-SCOTRAIL-CLASS-156-SALTIRE-LIVERY-DMU-SET-52437-DCC-mv-/330803709957?pt=UK_Trains_Railway_Models&hash=item4d05700805
How much!
Strangely the much better detailed version albeit a different livery is £125 cheaper! http://www.ebay.co.uk/itm/Hornby-R2693-KIT-BUILT-SCOTRAIL-CLASS-156-FIRST-LIVERY-DMU-SET-52465-MIB-DCC-mv-/330803709230?pt=UK_Trains_Railway_Models&hash=item4d0570052e