Is the connection feasible? If you check the [station map](https://cdn.networkrail.co.uk/wp-content/uploads/2018/04/Bristol-Temple-Meads-Station-Map.pdf) you can see it _should_ be, there are only four platforms divided by trains and there's a tunnel between them.

The reason I emphasized it should but it might not be right now because work is ongoing and the Bath-Bristol Temple Meads train was replaced by a coach just this weekend: https://www.gwr.com/travel-updates/planned-engineering/bristol2019 If that happens, being on time is extremely unlikely. The same is scheduled for Sundays 23 June and 7 July. If your travel is a weekend, tweeting https://twitter.com/gwrhelp or calling +44-345-7000-125 to confirm there is a train and not a coach is strongly advised. GWR doesn't do this workdays, that'd be madness.