I am now in...at last. Admin were quite helpful and gave me instructions to remove Cache as may have been why it was saying no certificate etc and not recognising a new one. But then I lost the google page that shows email address to log into. Took me a while to get back. Then tried getting into MSE and it came up with a warning message that Sky Shield was preventing access and where to go to change settings etc. After moving I have only recently had wi-fi connected but I was able to access MSE when first installed. And why did I not get any messages regarding Sky Shield previously? Sky never notified me in any way regarding the fact I had 'Sky Shield'. Anyway on finding it, it appeared that 15 categories were blocked, self harm, drugs , dating etc. I also believe there was some age restriction curfew, hence by a hit and miss fluke, able to scrape in late but not in the day. Sky Shield having a brief catnap perhaps? I could not see a way to just take 'dating' off the list though, only how to turn Sky Shield off completely, which I have. It seems that turning 'Sky Shield' off means that I can now get back into MSE.