Spacers are discontinued but sourced some on ebay for £7 delivered. BB n
ormally around £60. Tredz had an 'order today to get £5 discount' popup discount code. Perfect. Topcashback for 4.2% off, doubled with a promotion/voucher from them 'today only'. Paid via Paypal which prompted me I had an additional £2 off for some reason. Cool. Paid with AMEX through PP which also gives Nectar points, so around 1.5% further 'cashback'. Bringing the BB in at £47.90, so sub £55 including spacers for the BB, then £88 for the Ultegra R8000 cranks! So complete switch to Ultegra cranks, including changing to a quality BB for £147.
But I do need to source one of those Shimano crank arm cap things. I have one on my turbo trainer setup so will just nab that for now if it fits (5800 cap on R8000).