These ports being down resulted in me getting 4 ESP tasks which I decided to give a try.
They pushed my core temps up quite a lot so I attempted to see which cores were affected by temporarily stopping the clients individually, using STOPoptions 6 and 7, which I have previously never used.
Problem is when trying to start again, I got the missing lresults.txt error messages which flashed on the screen momentarily before closing the clients.
Net result is that I reinstalled the prpclients and started again. There are 4 ESP tasks which are now going to age to expiry - sorry.