Welcome aboard ET...
There are two of us here that own "directly" built Peter Cook basses (as I now undersdtand it) - Eric owns a Firebird "Twin" and an "Axis", I own a "Thunderbird"... no one I know owns one of these although one of the crew is after one if the beastie came up cheaply enough - I would certainly like to own one...
This is an occasional thread that I started some time back and I have a permanant watch for them... it details pretty much all of them and any related instruments that have come up, and what they have sold for so if your enquiry is for a sales value the you will only be disapointed - from an insurance perspective, you have something that was not built in great quantities but could only be described as an obscuirty...
If it had been one of JAE's Fenderbirds, you best avenue would be to contact a high-end auction room, or maybe Hard Rock...
Finally... may I congratulate you on being a member of a very select band of players... use the bass, don't sell her and remember her heritage... She's part of British Rock history... I'm not a collector, I'm a player; my Peter Cook was built to be played...
Oh yes, nearly forgot... pics please... the general rule here is that if the pics don't appear theres nothing but virtual words on a virtual page... what would be nice is some sound clips with a review...
Ken