Thanks Ron and thanks Gil,
The action and barrel are both blued and there's no other markings on the barrel at all. I kind of extrapolated the date of 2000 from proof info I have and finding stuff online but Birmingham proof date codes after around 1997 seem a bit hard to track down. TBH I've only looked for proof date codes on Enfields in the past with no probs, this new stuff's a bit of a mystery.
Matt.