Hi TammyW - thanks for your prompt response. By the time you replied, however, I had tried your suggestion along with other options I found on the internet. There must have been a short sort of delay in achieving such because it appeared that none of them resolved my problem - I was prevented from login to my phone at all! Anyway, I suddenly noticed that the phone was out of the switch control and functioning normally without knowing which remedy had achieved this. So I am now a happy bunny again!!
I have to admit getting into the mess in the first place by following as best I could the Apple Support module on using Switch Control to use my SE to control my MacBook. The module wasn't at all clear in certain stages and this was what led to my problems. So a 'negative' there for the Support module in my opinion.