RB not ridden in 4 years unable to shift gear After a bit of advice. I recently dusted down my Carrera after a 4 year stint in the shed. Knowing that it had a few issues I dropped it in to my local Halfords store. It required a few things mending with the most relevant to this issue being the rear derailleur.

I get home and decide to go for a quick ride and find that I’m unable to shift gear at all. There isn’t really any tension in the shifters and the chain is currently on the smallest cog. The obvious thing to do would be to drop it back in but if it’s something I’m able to sort then I’d rather get it done myself!

Images below although I’m not sure if it helps in any way.

Thanks in advance
If people can figure out what the problem is, you can probably fix this yourself without needing specialist tools. Honestly, though, take it back to Halfords and get them to actually do the work you've presumably already paid them to do, because this is pretty ridiculous.

In general, I'd recommend taking bikes to a specialist bike shop rather than somewhere like Halfords: the level of clue is generally much higher and they'll actually make sure the bike is working before they hand it back to you.