Many thanks for the prompt reply Jodi.
"Can we ask when you last accessed your Mobile account?" - As far as I can remember, approx 3months ago.
"When you click on forgotten password, do you get any error messages?" - Yes. "Wrong details" (or something similar). The bottom line is, I get stuck on this page and cannot access my account.
"How are you trying to log in to your account" - via my desktop pc which I always use to access my Virgin account.
"is this through our app or web page?" - Web page
"Have you tried clearing all cookies caches and history." - On my PC, why? Why would accessing my account which I have done many times all of a sudden not let me connect?
"....try using a different web browser and device if possible." - I have always connect via the same browser, 'Fire Fox' every time successfully. However, I have now tried both Edge and Chrome. Still no luck
Additional info - Whilst trying to change my password on-line I was unable to get passed the screen asking for the security code which had been sent to me. It just kept repeating the cycle asking me to "enter the code". I was also asked to enter my "memorable answer" to the prompt question which produced the response - "incorrect". (I tried different spelling, capitals, spaces etc. nothing worked)