I regularly move large sums over to our Spanish bank account using TransferWise via an app on my iPad and never had an issue with them. Exchange rate is currently 1.17165 and with their fee (£4.29) £1000 bought me €1166.62 so I look at the exchange rate as being €1.16662 when comparing
The exchange rate is the bests it’s been for 21 months so now is a good time to buy euros. Good luck.