PG Tips is not England's best tea, though I wouldn't be surprised if it's no.1 in terms of sales. Not the same thing!
It's worth considering that all teabags are not equal - some are intended for brewing a pot, some just a cup. I'm not absolutely sure which you were comparing. I go for the full-weight bags when making a cup, but don't brew for a full 5 mins.
I go for Sainsbury's Red Label (i.e. supermarket own brand) at home and Yorkshire Tea at work. But I'm not at all fussy: I drink a lot of tea (typically three in the first hour of the day, hourly in the morning then two-hourly until 23:00ish), rather than an infrequent cup to savour.
And tea with cream is just wrong.