Thank you for your answer.
Have to be sure I understand well.
So, you advise me to include all the other cost in Box 7, whatever some of purchases are Vat excepted or not?
Secondly, I should use the HMRC monthly exchange rate for transactions.
The difference between HMRC exchange rate and the amount shows in the bank statements and the additional fee for non sterling transaction I will add in box?
And about you saying at the end regarding the check that it may be possible to have from the VAT office, is it not normal to have zero rate or excepted VAT purchases?