Travelling out of LHR on the '24 on Saturday. Is there any option to be dropped of by Taxi at the Upper Class drop-off point used by the VAA Limo's - with prior warning/notification of course etc?
Depends what Fare Bucket your UC ticket is in.
I guess your travelling on a G or Z ticket in which case you need to be invited to take part in the 'trial' - if you are then you get an email 2-3 days before your flight. You could always be cheeky and ring anyway and ask! You need to book a slot to arrive during.
On the day itself you will then need to phone to give details of the Taxi - make /model / colour / registration at least 30 mins before your slot start time.