I popped down to GP at 3.55 pm this afternoon (Monday, that is), there wasn't another fan in sight and I was able to park on Braemar Road, right outside the Ticket Office. Bought 7 tickets (4 Adt and 3 Kids) and thought "Result!".
Went home, checked the tickets to see exactly where we were, then realised that although all in the same Block/Row, they weren't seated together (a set of 5 together, but another pair further along the Row).
Phoned the club and explained, and the helpful-sounding (Aussie?) girl said if I came down now, they would change them - "We're here until 5 pm." I pointed out to her that it was now precisely 4.58 pm...
Anyhow, gotta make another trip tomorrow to get replacements.
That'll teach me for previously posting elsewhere how helpful/efficient the Ticket Office Staff are! lol
P.S. Contrary to what I thought I'd read on here previously, they still had £40 tickets available (though being a flash Herbert, I went for the £52's)