Here are our very practical travelling tips with guinea pigs:
Travelling with guinea pigs
PS: I know that I am a bit infamous but I have travelled as far as South, Mid and North Wales on the train, to West and South Yorkshire and even to Sandwich at the end of Kent to pick up adoptees over the years. Other piggies have arrived here from Gretna on the Scottish border (pick up was once in Wigan and once in Warrington by Liverpool), Newcastle, from West Sussex and Devon and once even as part of an emergency from the Channel Islands; the last was a several days trip with a rather ferry crossing with the oldest of them being 9 years old; she went on to a private sanctuary in Liverpool from here with her 6 year old 'toy boy' companion as the last leg of her long journey and lived for another half year. None of the piggies has taken any harm.
Of the still living piggies, my three adoptees from the South Coast in Devon are now 6 and 5 years old (two different lots arriving at different times), the East Kent girls (which was a surprisingly straight forward 5 hours two trains journey with a mile walk between London stations and including plenty of wiggle time to make sure I was not going to miss the Coventry train) are now coming up to 5 years; my second Newcastle piggy is around 3/4 years by now.
I consider a 90 minutes drive/train journey radius as local as there is no decent guinea pig rescue in Coventry (the local RSPCA doesn't run them) so I have to look further afield.
The vast majority of my previous long distance adoptees have lived between 6-8 years of age.
I hope that these experiences from over a decade of adopting from all over the UK are helping you?
. Hope this info helps and again sorry for the late reply.