I believe Giffgaff pay as you go is what you're after. They will send you reminders of you use no data, calls or texts for 6 months or so, but if sending some data then you're golden.
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Try checking RWG Mobile , ScanCom or Mozillion
I bought a SIM card from RWG a while back that was a 1 time payment for 2 years contract for 1GB data per month. It was so cheap I never actually got round to using it.
I believe the other 2 do similar plans.
EDIT -
If you have no luck try searching IOT SIM / Internet Of Things SIM / Prepaid Sim
I can see some offers for 500mb valid for 5 years for £5
Not sure if this works, but I have an esim from airalo (but there are a lot of other countries) that I top up once a year.
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