Hmm thanks but that's not really the solution I'm looking for, it's a bit too messy.

the best solution yet I've come up with is to have 2 checkboxes, if the UK one is selected A1 = 1 if Swedish is selected A1 = 2,
then a second field A2 has the formula if A1 = 1 then 1, if A1 = 2 then 13,5.
So then every calculation in the rest of the document I have *Sheet1!A2.
So atleast now I don't have to do any User function, but I still have to make it *Sheet1!A2 on every field tho.