Lost gears

Hi guys was out today 20 miles into a ride when all of a sudden gears became difficult to change unable to change up lever felt as if it had lost all its movement checked rear derailer cable all seemed ok by the time I got home unable to change up or down its a Tarmac with shimano 105 any ideas
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This and that above
If it's fraying ok it's a new cable you need to put in.
If it's just pulled through you need to make it tight again.
Learn skills that could help you out in the road. It's easier than a puncture.
Really?
A puncture is a 5-10 minute job. With most bikes now having internal cabling and cables under the bar tape it can take ages to properly check - and then replace a gear cable inner, and that's without having to extract snapped cable strands from inside the shifter. Yes this is a skill worth acquiring for home maintenance but a quick roadside fix it certainly isn't.
Incidentally earlier this year a ride companion had a rear cable snap inside the shifter. We rode 10 miles to the nearest town, bought an cable and re-fitted it. Then rode back. Took best part of 2 hours to get back to where we were...
(Assuming that I haven't let it get to the point of fraying badly / snapping inside the shifter again...)
Under bar tape routing and internal cables can make it much more of a faff and a fix it at home job.
It isn't so much difficult as fiddly. A LOT more than 10 minutes (for me) and I couldn't have done it at the roadside.
I'm much too stingy to pay for bike servicing and enjoy the satisfaction of sorting stuff out, but I understand that isn't for everyone and if it keeps LBSs in business all the better.
Ive done more than usual over the summer and many times its friends who want to know how to do stuff so they can do it themselves in future.
I show them, and it keeps me in beer. Its not about saving money for most of them but saving time. The time taken to get to and from the bike shop. Much easier if they can order parts on line and fit them especially since most jobs dont take half an hour.
I'm not sure all bike shop mechanics know which way is up anyway.
Hi the bike has internally threaded cables but I’m away for two week so thought best leave it with lbs so all done when I get home he’s an independent trader so he’s never ripped me off before and I can trust him so why not