Thanks for your answer @Rea_M .  I seem to remember doing that fix when I had the same problem on my desktop.  Sadly though, I've tried doing that for Safari and Chrome on my ipad and it still doesn't work on either of them.

I don't get any error message though, just a blank panel (I've attached a screen shot)

Unlike @Tabby1 it has never worked on my ipad, I don't know if @Tabby1 is also in the UK.  Does it make a difference that I am?

Thanks again