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@nelaii
...so I ended up taking the bike into Bon Vélo, all I said was 'chain' and he knew exactly what it was and sorted it exactly as you all recommended, with the bolts.
They totally know what they're doing in Bon Vélo, it's running so smoothly now, none of the other shops had a clue.
Thanks everyone for your help, I really thought it was the chain not the chainring, let alone the bolts on the chainring!