Surprised they didn't offer ticket acceptance on the London Waterloo service. A slower train but would have cut your wait at Westbury and got you nearer the venue.
They sorta-did - they said I could use
SWR» services. Then in the same breath (I assume they breath in call centres) said my ticket would only be accepted if I dropped back to the next train on the same route, and I could not take the 07:21 and travel via Swindon - which (had the 07:21) been on time) would have put me in London 20 minutes down and not nearly 60!
I *had* considered going into Waterloo in the first place but chose to gain the extra few minutes earlier arrival (ha, ha) by going the more expensive way.