If you wax β ZFC-recommended path. Any top immersive wax covers 160 km easily on one coat. No carried oil, no mid-ride top-up. If the UK weather does its thing and a shower hits mid-ride, the wax rides through it β tarmac rain is just water, low contamination, and 160 km doesn't justify the post-ride strip commitment that oil-over-wax would force. The baseline road-sportive scenario.
If you're on oil β pragmatic equivalent. Apply your usual oil the night before β 160 km is well inside any decent oil's single-application life. No top-up bottle needed. If a shower hits, no protocol switch required β you're already on oil.