Just to update this post.
On this machine I have managed to obtain the following:
1) Close the door (The following operational sequence must take place after switching on the appliance)
2) Set program selector to OFF position
Wait for at least 2s
3) Set program selector switch to position 15 while the Start/Pause button is pressed until display is active
4) Release Start/Pause button
All remanent errors will be reset
Funnily enough , I went to one today and found its this old method of resetting faults/entering test programme. I wish they’d make their bloomin minds up about which method to use !