Cheers mate! Now all that I have to do is make a note of that and remember where I put it in about 11 months time :/
Windows defender has improved since the last update but historically it's been sub par compared to the stand alone security products. Real World Protection Test Oct 2018 AV Comparatives are a 3rd part AV tester and use the scientific method to put AV software through it's paces. Windows Defender scored well in Oct but also resulted in the highest false positives. AV Test is another great website for thorough AV testing.
Enlightenment coming up! There is no need to uninstall and reinstall.... On the program front end click 'Help' then click 'Enter product Key' under 'Account Information'. You can also check for newer versions of the program on the same page too.... :)
Congratulations OP, you have managed to get a Norton deal to go hot, I don't think I have ever seen that before.
Looks like the price was for one day only. As of 0130 on Dec 01 it has reverted to usual price ie. £19.99 for 5 devices or £24.93 for 10