It is certainly rare - though I have no idea on the value, sorry mate.
Is this the tape you have: http://www.starwarshomevideo.com/2018/11/star-wars-uk-video-2000-v2000-1983.html ?
This may contain some useful info to you: https://www.youtube.com/watch?v=UUo3_sDX-rU (Nathan Butler youtube channel)
The starwarsforum.co.uk - a UK Vintage Star Wars Collecting Forum may be able to give you some clue on the value etc.
There is also the https://forum.rebelscum.com - US-based; yet larger Star Wars collecting forum.
We also have a discussion thread, here - The Original Trilogy on Video 2000 (V2000) (as well as threads for other older formats such as Beta, VHS, CED, VHD, VCD, Laserdiscs, Video8, and Super8, etc).