Hi there ,still new to all this,do a lot of festivals but no internet connection,any pointers on is best to use to  get internet when sort of ,off grid thanks 

https://evergy.co.uk/givenergy-4g-mobile-internet-dongle-5yr

Worth a shot with 5 years connectivity included.

Otherwise get a 4G/5G router, add a data SIM of your choice.

If you ae a BT customer you may be able to connect to their system.

I cannot remember what it is called but, depending on where you are (at that time), you may be able to connect to it.

However, it is not particularly accessible in remote or country/rural areas