Unless the bike was raced by Pantani or something I doubt it is worth it and even then I would still just wall hang it. No need to kill yourself over any bike even if it were brazed, raced and signed by Eddy Merckx himself after being blessed by the Pope at the Colnago factory with Tulio Campagnolo also present with a special one off gruppo for the bike.

Any of the modern stuff they are selling on Halfords is most certainly not worth the risk. They are all low initial cost bikes and if they can replace it go for it if not just hang it on the wall or try and recycle it or toss it and get something steel, easier and safer to repair if need be.