At that budget I'd go for a Boardman (10% discount with British Cycling membership), or Canyon Roadlite AL.
https://www.canyon.com/_en/roadbikes/bike.html?b=3073#tab-reiter2
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£870, you would be bonkers not to go for this - I'd be happy racing that bike in pretty much most races. It's not much over 8kg either.
Also check the discontinued models out for Canyon and Rose as well, good specs with a bit of cash saved!
Do you have a website address by any chance?![]()