I'm in Newcastle, but can easily get to the link light rail system.
If you only want to go for one day, the cheapest registration option is to register for the zero-retries conference
https://www.zeroretries.org/p/conference as a Zoom participant, and then you get a steep discount when you register for the GNU Radio Conference. The zero-retries conference is in the same convention space, the day after the GNU radio conference, but "are not connected".