Sitting at home having finished my Christmas lunch and feeling the need to get out of the house, I thought let's go for a nice drive up to Brecon for the afternoon and walk the corgi's. However I was reminded that there was very little petrol in the van and Tescos was closed. End of drive to Brecon...full stop. Have to wait for Tescos to open tomorrow!
Now my question. I have a '90 2.1cc Type 25 and have had it about a year now and always fill it up with Tescos "super unleaded", because the guy who sold it to me told me to and not to use anything else

What do other T25 drivers fill up with? Could it be normal unleaded or does it have to be "premium" or "super" or whatever else.
What else can I use? Any guidance on petrol issues most welcome.