There is no reserve value, which is what surprised me, as I have seen items start at £300 plus. £200 was what I was comfortable with. I now know, from the comments on here, that it is worth much more than that, so I will decide what my limit, including fees, will be. I'll see it before I decide to bid and then see what happens. I will bid in the auction room. I have bought the odd thing there before so I know how it works.
What I have learnt from this forum in addition to my internet searches is that this is a valued, collectable piece.