I bought a clutch kit from Louis Moto a couple of months ago for around £200 (the best price I could find in the UK was around £360). The customs charges were over £50, but Louis Moto refunded these after I emailed them photos showing the fees paid to Royal Mail. They mention the promise to refund charges on their website.
The madness of Brexit means we all pay higher prices and have less choice. It's basic economics; a smaller, more restrictive, market and less competition means higher prices. I used to buy lots of motorcycle and cycle parts direct from Germany-good prices and great service.
Europe produces the stuff we want to buy in the UK and they want to buy the stuff we produce. And it's geographically close, which is no small matter in an age of rising fuel prices.