Ah well they must do it differently at Glastonbury then as I clearly heard a synth line start then she started playing it a bar later with no audible change?
It looks like your new strings may be fatter than the slot in the nut, unfortunately this can happen if you don't open the slot with a suitable needle file prior to fitting new strings.
How the he'll did that reach £124?!
I sold my Epiphone Thunderbird for £110 posted recently, with a decent gig bag and the headstock still attached to the rest of it!