Sad news - Esso Synergy Supreme +99 Petrol is changing in Sept 2023 to contain up to 5% Ethanol
Enjoy the last summer of decent petrol is all I can say. The majority of UK fuel has contained ethanol for many years now, & i'm coming across issues with both classic & newer vehicles due to this. It's causing corrosion in steel parts within the fuel system (eg tanks & banjo bolts), & resulting debris clogging filters & eventually blocks carburettor float needle valves. I've been recommending fitting Filter King units with glass bowls to any vehicle not yet using a filter, so you have the best chance of stopping the rust etc reaching the carb (and pump in most cases).
You can read about Esso's Synergy changes here: https://www.esso.co.uk/en-gb/fuels