Background1/2 live cash game (at DTD).
Table is currently 7-handed. There are two very loose and aggressive players (seat 4 and 6), and the rest of the table is fairly ABC-ish, with a fish in seat 2 (me).
The handSeat 6 raises to £9, seat 1 calls, and I look down at

on the button. I raise to £23 and seat 6 and 1 call. So there's three of us to the flop, and there's £72 in the middle.
Flop:

(Stacks: seat 1 = £400, seat 2 = £350, seat 6 = £1,200)
Seat 6 leads out for £60.
Two scenarios - that I wanted opinion on.
a) seat 1 calls - what do you do?
b) seat 1 folds - does this change our action?