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BUT I SHOULDN'T HAVE TO!
Nor should you have to have javascript nor Java enabled! but too many web 'developers' are too lazy to figure out ways to do the same thing without them. The Health Service site, probably makes use of some ActieX routines that only Explorer can use, and even then only on a Windows machine. Or it may just be checking for that specific browser as the agent it wants to 'talk' to. At one time Explorer offered a higher security level, but that was long ago and far away!
I think the whole attitude of some IT departments needs to be 'load shed' and re-started!
Just don't hold your breath, you'll turn blue, same color as some 'screens of death'!