As it says above on the tin, I wonder if there is a bulk ordering service maybe out of Britain for us Brits starved of civilised fare. Mine are sent out my parents in quasi Red Cross parcels and when they visit but it might be easier of I could heve a years supply shipped out. Maybe I could even be a local "pusher" of this to expats?
Tea bags are so easy to bring in luggage though as they weigh hardly anything. I bring teabags all the time. I just empty 2 or 3 large boxes of them into largish carrier bags and sort of lay them out on the bottom of my case.
Tesco here in Budapest sell them.
Mind you PG Tips are yucky imho - I bring in proper strong Irish tea!