Great Britain - London Underground

When an acquaintance from the UK asking me what recent GB stamps I would like to get in return of some bird stamps of Malaysia, I browsed through the past stamp issues of GB, and I noted this London Underground stamp issue. These stamps remind me of my few years of living in Reading (west of London), and that I quite often travelled to London... Time flies, and that it was 18 years ago I was there living in Reading...