Ah I get what you were saying, I thought you was talking about physical slot switching
That link is brilliant thanks! Only lists the 'traditional' pay as you go that don't expire. Im even thinking the asda sim could be an option that I can at least check later today. Looks like you only have to make a call with the sim to activate it and can top up in store. So the only info they can get about me is the EMEI of the sim slot it's in. All good
Phones are awesome these days:
https://i.imgur.com/44eBpg1.png
https://i.imgur.com/pfcN1Xc.png