after at least 2.5 months of fighting with various templates to create this map I eventually settled on Isomeric Town for the buildings and Mike Schley's Overland maps for pretty much all vegetation apart from the fields (Fantasy Town tends to be my 'Go To').

thank you both for your help. I'll know what to check if it happens again.

Thank you all for your help

You can fit some of the house symbols in the Isometric Town from the same annual to create a terrace of houses (a series of houses that are joined together) but some of them are more fiddly than others to get them to sit together @Royal Scribe .

EDIT: I just discovered the Beaumaris template doesn't appear on any style on the NEWWIZ chooser panel/interface. It is installed in with the other Perspectives options but it doesn't show up on the template list. I had to go into the folder lists to find it. Very handily it is isometic-ish and sits fairly comfortably with the Isometric Town symbols.

it turned out to be quite easy to lay out - mind you, it was only down to my additional sheets! Whoever invented sheets needs a Nobel Prize for services to mapmaking!