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sbbohr
Hey Bobble, nice bike! I’ve just looked into the same thing, so:
if you’re happy to stay with 10 speed then I’d consider going smaller at the chainring end. FSA make a subcompact 10 speed crankset (Omega I think) that gives a 30 tooth at the front. Possible new BB needed though.
Otherwise, a Tiagra 4700 GS derailleur allows for a 34 tooth cassette (possibly even a 36 tooth MTB cassette) without any modification. I’ve just bought a 36 tooth cassette, if you’re interested I’ll let you know how it works!
If you go Tiagra at the back you’ll need Tiagra 4700 shifters though, as I understand the pull ratio is different to other 10 speed shifters. Shop on gumtree/eBay/Facebook marketplace for bargain Tiagra 4700 parts, people often pull them off to upgrade to 11 speed.