Would be very hard on Acklam imo. But at least they would know what to expect. Would be interesting to know who else may be level transferred. Suppose that Stockton and B. Castle if they weren't promoted would be likely candidates as would Guisborough depending on where the geographical lines are drawn.
I think Barnard Castle are in the Durham county and wont be transferred. Whereas Stockton and Guisborough are more likely to be moved across if needed.
Got nothing better to do, so just done a google maps check.
Based on current league positions in N1E, DN1, DN2, Y1, Y2. Assuming nothing changes - yes, we know it might. And that two go up from Y1 (assumption).
The likely candidates for Level Transfer based on mileage and shortest route (according to Google) are:
Acklam - 828.9 miles
Darlington - 854.8 miles
Stockton - 882.5 miles
Guisborough - 882.7 miles
Redcar - 910.4 miles
Barnard Castle - 928.1 miles
Excluding B.C. from the equation, the local mileage between the above leaves us with;
Acklam = 880.1
Stockton = 946.9
Darlington = 947.8
Guisborough = 948.4
Redcar = 975.7
B.C. = 1052.3
The saving grace for B.C. is the distance to 'Ensians and Beverley.
Acklam could have a get out depending on the correct interpretation of Reg 13 Level Transfer. I think you'd need the Lawyer who penned it to explain.
So, all pretty close. Only needs Heath to manage promotion and Redcar enter the mix for Level Transfer.