One of these machines, think it's the same class, resides at the Science and Industry Museum in Manchester. Unfortunately it is painted B.R blue and not in the same livery as yours
You know Ziggy, after a bit of thought I do recall it being 06 which would make it the same class as yours.
Just had a google, turns out the 06's were 0-4-0 & the 0-6-0's were 03 class. I do remember seeing a shunter on the Isle of Wight & thinking there were only a couple of those in existance, will probably have to google that too.