Mr Red's distance to a venue page
The page lists session in my area. Exeter to Shrewsbury and Cardiff to Oxford (ish). Nothing new in the data per se but I have embedded OS grid references.
This enables me to offer a link that when clicked will change one column to the distance from a centre of interest to each venue listed (as the crow flies).

Aha! You ask, "What, about the Bristol Channel??"

Well I have trained my crows to avoid water and recognise toll booths when they see them, and add 20% (VAT?). In theory. What does the combined wit of the Mudcat say?

There are other facilities like "choosing the centre of interest" (town), predicting the likelihood of the event happening within 8 days, OS grid reference if you really really wanted them and making the Post Codes more obvious (they have been there on pop-up reminders for years.

Works on FF and IE. And apart from a few dodgy Post Codes and 2 weeks programming the trigonometry (don't ask) it was pretty straightforward.