Unfortunately it is entirely possible for a battery to leak (in which case it would damage the circuits), and it's also possible for a battery to last less than the standard 2 to 3 years - not enough intial charge, a battery manufacturing issue perhaps, or even simply that the previous owner just used the backlight function a lot.
I'm surprised that Goldsmiths would be able to properly examine a watch internally as usually AD's in the UK defer all of that to Breitling UK. Either way, if a new movement is required, I could well imagine the cost being in that vicinity at BUK.
Just incidentally who did the battery change last time? BUK or a random jewellery store?
The crystal is another matter. You need to find out why they are recommending a change. If it's compromised it some way (although I'm not sure how!) then there may be a genuine reason to change it. If however it's just something like microscopic scratches to the AR, then it's up to you if you want to get it changed - no-one will force you to.
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