Hi it’s my bike and yes the shop that sold me the bike also completed the service. It was a free service that you’re entitled to as part of the cycle to work scheme. I don’t know what chain set they’re offering, not knowing what one was I felt too silly to ask. Since having the bike I didn’t even think to check all the bolts were tight. I will from now on but I definitely stopped riding it as soon as I felt the pedal wobble. It’s just a bit confusing as the shop seem so sure that they couldn’t be at fault and suggested that Cube agreed that the mechanic’s action to use loctite was appropriate. I can contact trading standards and get some more advice but I’ve lost confidence in using it – I realise bikes will fail when you’re riding them for all sorts of reasons but the mechanic told me that using loctite only ‘might’ work as some of the threads are busted.
I appreciate the posts and realise that the shop may not be at fault – it’s tricky when you know so little about mechanics