Rare Record Info Needed

I have a lead on a 1966 Dalek 33 RPM record from Century 21 (average condition; record good, but sleeve not protected throughout the years). I need to figure out a value to offer the person as I want to put it in the museum.

Anyone have any ideas? It would be nice if someone familiar with the UK side of things knows anything about its rarity...

There are some sites that you could check, but since one I usually mention gets removed I wont put them up here. Rule of thumb I have found is offer as much as you are willing to pay. The actual recording was placed on a certain sharing site a few years ago, so you are just paying for packaging.

I assume it's this one? Have a look here and see what it has gone for in the past.

https://www.discogs.com/No-Artist-The-Daleks/release/3938861