Thank you Pondus 
1483 is not latest avast... 1488 is
Thanks for this. Seems to be another issue then… I have set avast to update the programme automoatically, but it didn’t do so.
Anyway, I have updated avast and run a scan (no problems detected), and also run scans using MBAM, OTL and aswMBR - the resulting .txt files are attached.
MP