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Something's worn or the chain is too long. Your cassette and derailleur don't know how many chainrings you've got and you would expect them to work at either extreme end of the cassette in either chainring of a 2x set up so chainline is a non issue
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He has not been able to fix the problem but seems to think it's the fact the bike is supposed to be a 2x10 not a 1x10 that's messing up the chainline. Theres a weird spacer between the DS BB shell and the BB itself which I don't really understand.
The bb spacer is normal. 1 driveside spacers for a 73mm shell (which I presume is what you have), 2 driveside and 1 on nds for 68mm shell is the typical external bb set up.
If your lbs mech didn’t know this, don’t go back there.
PhilDAS
M_V
@Tonts
I bought a genesis longitude off ebay earlier this year which had been converted to 1x. Once i'd put it together I found the gears skipped under any pressure, not bad shifting but as if the chainrings/casette/chain were worn - but they're not. So I got my fixmybike voucher and took it to a guy local to my work today who works out of his garage. He has not been able to fix the problem but seems to think it's the fact the bike is supposed to be a 2x10 not a 1x10 that's messing up the chainline. Theres a weird spacer between the DS BB shell and the BB itself which I don't really understand.
I'll add some photos off my phone of everything, but I'm veeery open to ideas on how to fix this that aren't spending a load of money reverting back to 2x10.