Well, in the end, I took my existing plan down from £12 100gb down to £6 4gb for the renewal this weekend so I still have the capacity to call, text and a wee bit of data to get me through the next few days, then I took out a totally new plan and acc...
I don't feel one has to give a reason, that would be a privacy thing for me. Thank you for the response though, probably I will have to go to webchat, I am facing the same issue, I don't want to shell out another 12 quid for a separate plan, the mind...