WordPress Geolocation Script Needs Fixing - STRICTLY UK ONLY

I have a geolocation script taken from another project which needs adapting to suit a different post type. I also need a script added that adds latitude and longitude values to the business listings (based on their address field) when the listing is saved.

The page is built and is mostly working, all styling is done, so just needs some tweaks to the JS to get it working properly.

UK ONLY PLEASE DUE TO TIME ZONE & WORKING HOURS

Please start your proposal with the word "fish" to prove you have read this brief in full.

Price given here is based on how long I think it should take to complete. Needs doing within a week.