Using http instead of https for download

[KoalaGeo]

User reported getting error trying to download ags data - the spatial search download link appears to be pointing at http instead of https

If I copy the link it's using http://agsapi.bgs.ac.uk/ags_export_by_polygon/?polygon=POLYGON((-6.856%2052.755,-6.856%2053.126,-6.285%2053.126,-6.285%2052.755,-6.856%2052.755))

[KoalaGeo]

API ags_export_by_polygon is returning self: "http://...." which is what's used to make the link in the popup.

https://agsapi.bgs.ac.uk/ags_export_by_polygon/?polygon=POLYGON((0.204%2052.029,0.203%2052.029,0.203%2052.028,0.204%2052.028,0.204%2052.028,0.204%2052.029,0.204%2052.029))&count_only=True

Needs fixing in the python, not the .js.