Tool Man, It is best to telephone William Powell in Birmingham rather than email, they must suffer a huge number of emails and simply don't have the man power to respond, a ringing phone is more difficult to ignore. I contacted them for a record of the gun mentioned below and they were helpful and prompt.
As regards the original question, I have a Powell SLE on my web site
www.heritageguns.co.uk which may help to put your gun's value in perspective. Note mine is the rare Lift Up toplever version although sleeved and fully overhauled which will effect the price.
