Thanks fer your replies Watty, DMG, MFH and Stephen, it seems that I should be OK'ish traffic-wise fer a 9.30am pick-up.
It's fer me Mum as usual, still going strong at 85 on her way home from her hollibops in the USA, and as it's me Mum she still gets the 10% Family Taxi discount !
I'm taking it that the zone/area 18 to Taxi park is still available, can anyone confirm this ?