This information is mostly taken from this PDF file.
Train and bus directions
There are two mainline railway stations in Bristol, Temple Meads and Parkway. If you have a choice, you are advised to arrive at Temple Meads as it is much closer to the University precinct. Bus services 8/8A or 9/9A run to the precinct every 10 minutes during the day, and taxis are readily available. To get to Maths, Take service 9 or 9A, disembark outside the Hawthorns on Elton Road. Go across the zebra crossing (Woodland Rd), turn right, cross the next road, and go up the drive in front of you, marked Stuart House. This will bring you to the front of Royal Fort and Stuart House. To access the maths building bear left, past the front of the houses, under the arch (prince Rupert’s Gate) and turn right at the next road. The main entrance is a few yards along, up the steps to your right.
To get to the Maths department, and Royal Fort, from the airport you can either take a taxi, or use the Airport flyer bus service, which will take you into the city centre. The bus ride will take you approximately 40 minutes.
The airport bus number 330 goes very close to the hotel after stopping at the main station (Temple Meads). The other one (number 331) does not.
All invited participants will be staying in the Marriott Hotel on College Green (near Bristol Cathedral). Be careful: there is at least one other Marriott Hotel in central Bristol! Their room charges including breakfast will be met by the Heilbronn Institute (University of Bristol) but extras will have to be paid for.