I just need to tap into some sensible advice here. I'm rarely in London & feeling overwhelmed about this trip. Probably because I've been ill recently.
I promised to take an elderly relative to the West End & need to get us from Victoria Coach Station to the Theatre District. They're very slow & mobility has declined since I booked the tickets.
It's a matinee thank god, so we won't be lost in the dark, lol 
Do we book taxis from Victoria, or is there a rank? Do I chance flagging one down, at each end of the trip?
Last one, any recommendations of not too busy places to eat either side of the performance. Close to the Sondheim.