Exchange rate for tax return


Hi
I gather the tax authorities will accept the exchange rate converting £ income into Euro from the Banque de France monthly average.


I have arrived at an average for 12 months of .7853.66 which I believe is £1 = Eur 1.2733 for 2014 Hence for every £1000 = e1273 on returns due in May 2015. Anyone have any other calculations or clues?


Ref site


https://www.banque-france.fr/en/economics-statistics/rates/exchange-rates/main-monthly-average-euro-foreign-exchange-rates.html