I also arrived on BA888 on Friday (still here), but hired a car - haven’t used the public transport option for nearly 20 years.
i was very pleasantly surprised that my checked in suitcase was among first five-six on the belt and they started coming out very quickly (I was in row 8 so reached the passport control quite quickly, having bypassed few people as well during the long walk).
in stark contrast with LX and LH over the last few years, where they often take forever to arrive (or never as was once the case).
I dropped it off about two hours before departure at LHR, no priority tags).
in terms of LF, there were about 100 people on the Friday flight (180 seat A320), including around half of Club Europe (five rows).