Hi all. I wonder if anyone has a good source stating the average length of a mews (the street)?

Good evening,

A teacher at a local school has a query about biodiversity:

"I thought I would just get in touch as I am running a project with students at the school where I teach science, in which we are comparing the levels of biodiversity in cobbled and tarmacked mews in Westminster. I thought it might be of interest to you and that you might perhaps have some comments to make about the factors that seem to influence biodiversity in mews - I'm getting the sense that traffic and the age of the (undisturbed) cobbles are unsurprisingly big ones! I wonder also if you have in mind any mews that seem to have a particularly high amount of plantlife between the cobbles?

The best example we've found so far was Sherlock Mews. We're right across the road from Wythburn Place, which is another good one. "

Any thoughts?