I wasn't suggesting that your window cleaner isn't trustworthy. I'm concerned that if your device has suffered a malware attack then the payment you thought you were sending to him may have been diverted to a scammers account. That's why I asked that you check that he has received it. As I said above, malware can redirect your cash by altering the recipient's account details.
All the big banks have 24 hour emergency lines: Barclays, HSBC, Lloyds, NatWest, Santander and Nationwide Building Society. Do call your bank as soon as possible.