Alas I spoke to soon and my phone has reverted to not waking up from its slumber.
I have tried to do re-do everything I did last time to kick start it but to no avail.

It crashed again when I was looking at a webpage and then went back to its sleeping mode so it might be to do with system memory.

I have tried the advice above and lost all my icons but will try again.

If there are any other users that have had this experience and know of any good fixes I'd be very grateful for any advice.

Many thanks,

A much sadder Migs