This year, I got the train to Temple Meads on the Monday and the bus to Glastonbury Town from just outside the station and it was a joy. Beer all the way and lovely views down through the country.
Shuttle back to BTM the following Monday.
At the risk of shooting my own travel costs in the foot, did you know that on the trainline.com site you can put a journey in from point A to point B on the intended dates of travel and they email you when the cheapest advanced fares come on sale?
If you then dive on the Split ticketing app and work the chicanery on there, you can get a result. I paid 40 return last year from Chester to Bristol and then the a few quid to Glastonbury on the bus. I cant remember what I paid to get from the site back to Bristol on the Monday morning as I was fucked out of my mind and cant remember taking my tent down. Proper festival beer scooter scenes...