Adam. This is a big question.
As a rough guide you can split England up into a few rich pockets. South east would include the great south coast links such as Royal St Georges, Rye, Deal, Princes. Moving in land, check out Royal Ashdown Forest, West Sussex, Piltdown then onto the great London Heathland courses. These include The Berkshire, Wentworth, Sunningdale, The Addington, Walton Heath, Swinley Forset, St Georges Hill, Woking, West Hill and Worplesdon. Go West about a hundred to two hundred miles to Burnham and Berrow, Saunton, Westwood Ho and St Enedoc. There are many others to chose from including a quick trip to South Wales and Royal Porthcawl etc. There’s a good batch of Parkland layouts around Birmingham but head to Lancashire and the likes of Hoylake, Southport and Ainsdale, Hillside, Birkdale, Formby, Hesketh. The list goes on. You could catch the likes of Silloth on Solway but it may be best to head east to Ganton and Lindrick and then south to the east coast classics such as Hunstanton, Brancaster, Sherringham, Woodhall Spa.
Avoid all courses that are too heavily into corporate golf. These generally would include the eurotour venues but I’m not going to mention any names.
Adam, you should be able to get on nearly all of these FOC assuming you are a member of the GCSAA but obviously you would need to do a lot of ground work first. When you’re doing the London and south west section let me know and we could meet up for a round somewhere.
An ambition of mine is to set up a regular golfing trip between the US and UK superintendents on a home and away basis so make sure we meet up and maybe I could start to sow the seeds.
Cheers. E-mail me if you need any further info or contacts.