I've done a couple of the South Glos Evening Triathlons now and look forward to them as a mid-week tri blast.
The site is good with a very clear quarry swim. The run course is short and sharp over 3 laps, crierium style.
The run course is on a quiet back lane.
Overall the event is well run and has a good mid-week vibe. A really great option if you work weekend etc.
You can also check out my YouTube overview on the event here: