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Have counted the sprockets, but appreciate the advice anyway! Don't think cassette has been replaced and think issue isn't with the chain and cassette because the issue stems from the fact that the derailleur arm is not moving.
I have now also developed an issue with a different bike (fixed gear conversion) - the square taper BB has developed side to side play and squeaks with each pedal rotation on the left. Issue started with what sounded very much like a crack when I put pressure into the pedals; I kept going the last 3 miles to the end of the ride slowly and have left the bike to lie for now. BB was replaced last year (UN55) by a competent LBS (Nip Nip along Tower Bridge) so seems odd to me that it would have broken so easily..
Given how much it cost me the last time when I got the BB replaced because I was loathe to get my own BB tools, I have decided to try to attempt repairs myself. What tools would I need to service/replace this myself (given that it sounds like the BB is shot), so would that be a crank puller, BB cup tool and a new UN55? I see cheap ones on eBay for 5 to 10 quid - would that be a bad idea?
I’m not being mean, but giving the chain and cassette a good clean wouldn’t hurt. And this is going to sound like a stupid question, but now many sprockets are there on the cassette? It’s kind of hard to count them with the muck. :D
I only ask because I had somebody come it the shop with ‘crap’ shifting after they replaced their cassette themselves, 10spd Tiagra for ‘a cheap one of the net’ or as I pointed out a 9spd Sora one. Oops!