I’m assessing 22 is Cirencester, so 23 is Bicester. MG is a field just E of 23.
27 is Bath and 33 is Ilchester.
The coincidence is all three of these happens to be they have a fresh water supply, so a good place to stop for filling up.
The straight line from 22 to 23 to 24 ( Cirencester, Biscester, St Albans ) doesn’t happen on the real map.
Fantasy conjecture IMHO.