I go through LHR several times each year. I seem to remember that they used to not even bother stamping my passport but now they scrutinize it carefully and ask questions and even stamp the passport and make hand written notations on the stamp. The questions are also getting a bit irritating.... and their attitude is a lot less friendly than what I have experienced in the past.

I was in London twice earlier this year (Feb and Mar) and a few times last year and I can't find any stamps in my passport for those entries.

I went through LHR immigration twice in the past 2 weeks and each time they stamped my passport and wrote "VIPP" (or is it UIPP)? Does anyone know what that means?
Thanks.