Ok so Yorkshire 4 will be 3 leagues of 10/12 teams.
Yorkshire 4A
Harrogate Pythons 2
Hessle
Hullensians 2
Ilkley 3
Knaresborough
Richmondshire
Ripon 2
Thirsk
Wensleydale 2
Whitby
Yorkshire 4B
Aireborough
Baildon 2
Cleckheaton 2
Huddersfield Laund Hill 2
Keighley 2
Leeds Medics
Leeds Modernians
Leodiensian 2
Old Rishworthian 2
Roundhegians 2
Yorkshire 4C
Barton & District
Dinnington 2
Goole 2
Hallamshire
Maltby 2
Sheffield 3
Sheffield Oaks
Stocksbridge
Thornensians
Wath upon Dearne 3
Wheatley Hills 2
Wortley
I can see some fixtures on the RFU site, the rest on RFU North but I wasn't sure if they were accurate given they have each team playing each other back to back throughout the season in Y4C.
I think the balance is pretty good in A and C, I think Keighley and Cleckheaton 2's are a bit overpowered in B but time will tell. Be interested to see how they handle promotion and relegation from 2 leagues to 3 between Y3 & Y4