Heathrow, westfield and uxbridge charger were originally 28p per kwh they hiked the price right high.. and i have genuinely stopped using Tesla superchargers.
I am a member of Elli network and i oay £12.99 it gives me access to to all BP SUPERCHARGER, Shell recharge, osprey chargers, fastned chargers and all chargers in europe as ELLI has partnered with various different companies.
The price i pay per kwh is 35p and for ionity chargers its 27p per kw.
I also created personal charging point data on google maps showing me the chargers that i need for my journey and so far in UK i have added around 90 chargers out of the 10,000 they have. And around 100 all over europe covering from paris to Switzerland, Amsterdam, Germany and etc and all under the same membership.
Heres some images;
I hope this helps.
P.s. the blue pins are my saved chargers that i prefer to see on my google maps.