If this is for your self assessment tax returns you should have a filed returns for 2017-18 and 2018-19 already. Going by the information you stated it might be far better for you to use all crypto related profit/loss in one place using one transaction rather than spreading it out for all fiat to crypto and crypto to fiat trades.
Quite simply, tally up everything you sent and received in those 200 fiat to crypto trades in EURO, calculate whether you made a profit or a loss. If you made a loss then that is that but if you made a profit you can use the EURO figure with an average exchange rate to get your GBP final profit/loss figure. You can also go a step further by looking at exchange rates from EURO/GBP and GBP/EURO for each transaction to get a very accurate figure otherwise simply go with an average figure.
As long as your crypto and not been converted to fiat and is sitting in a wallet you do not have to calculate any tax for them but the moment they are converted to fiat you must declare it.
hey guys
I am using cointracking.info to track my trades and talked to their support already, they told me i have to change my account currency from EUR to GBP and then enter all my EUR trades manually but in GBP. This will take me easily a whole weekend, as i did more than 1000 trades since 2017.
i checked my trades, and i have close to 200 Fiat to crypto (and vice versa) trades in EUR, the rest is crypto to crypto so i guess for the latter ones i don´t have to do anything, no ?
Does anyone know a better way of doing this ? or a different software that can handle that ?