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user58259
Sheldon Brown and the Park Tools blog are two good sites to familiarise yourself with the names of parts, basic mechanics and potential problems/incompatibility.
Clarks make decent cables, chains and brake blocks at budget prices: you can get them via eBay or a bike shop.
Being French, Peugeot did make their bikes to (the now defunct) French standard: notably the headset & bottom bracket threads and diameter of the handlebar stem.
However, bikes for the UK market were made to the (now universal) British standard and by the late-Eighties they had completely adopted it, so it's unlikely to be a problem for you.
The only exception to this, is the diameter of the seatpost: it will likely be 25.4mm (from memory), which is smaller than is common. Hopefully you got a seatpost with the frame, but it will be an old-fashioned "bullet-nose" type with a separate clamp to hold the saddle.
If you want to replace it with a modern post with an integrated clamp, the only (economical) option is this one from Decathlon.
Have a read of this thread, it should be useful.