Aviation art collection ?

Hi All,
I was wondering if anybody knows of a good Aviation art print valuer here in the UK (Warwickshire), when trying to renew our house contents they wanted individual print details which is understandable, my problem is I have prints that are veteran signed at signing events with quite a few that have passed but a couple do not have the artists signature. What I need is for a valuer to assess my collection and would very much appreciate any suggestions please ?………:eagerness:
Geoff.