I made use for a booking in April where I was trying decide between parking or using the train. This deal made the choice very easy. ^
It doesn't seem to work for me for dates in early May though (completing well before the 21 May date mentioned in the original post).
Originally Posted by
larryflyer
For others considering parking at LHR, note also that bookings made via BAA (including via the link posted by luxury_travel) can be cancelled up to 24 hours in advance, without penalty. So you can't go wrong.
I agree that bookings made through this link are cancellable, but not true for SuperSaver rates booked via BAA.