eBay and Craigslist finds

I’d say it’s probably worth £150-200. Here is one that’s for sale here recently for £180 https://www.lfgss.com/conversations/335928/#comment14808817 ( here’s the original thread with pics https://www.lfgss.com/conversations/317963/#comment14808150 )

Decent...but a bit top heavy on pricing as I would probably change up drivetrain (chainring, cog and chain looking a bit old). Steel langsters can be bought cheaper if you persevere. Save 'langster' on your ebay feed and you may stumble across cheaper.