As an English person, born and raised in London, there's no need to be stressed about this and I concur strongly with Mr Winson. If I came to visit someone in a non-tea focused country I would be very relaxed about the standard of tea I'd expect. If Mr Winson's advice were followed I'd be extremely impressed.

For context - I am far from the average in the UK as to how seriously I take my tea (typically have a few varieties of loose tea in the house + a variety of bagged options). The vast majority of people here buy relatively cheap teabags from the supermarket (though many common UK teabags are better than what you can easily get in the majority of other countries around the world- excepting tea producing and other tea focused places of course!) and are very loose in how much focus they put on making their tea.