Absolutely lovely, but you should be aware that the Class 20 cab has the doors in diagonally opposite corners. Compare this photo with the cab on your loco and you will see what I mean...
http://www.railphotoprints.co.uk/index/detail/1126/20141-Toton-110884-RP596.jpg.html
This arrangement arises from the placing of the driver's controls in the cab. There are two sets, again in opposite corners, with one set for hood forward and the other for cab forward. Wherever he sits, the cab door on the driver's side of the loco is behind him.