Oh yes I see, Usually not a consideration I would make, most charts are printed at delta T20 for your average boiler. Only lower temp systems have an impact on radiator sizing ie not a suprima
Only just realised the size of the OP's boilers once I had reinstalled my glasses (thought they were off for the night). Installing x2 boilers is a good practice in larger properties (if properly sized) but in this case, would have worked better just from one.
Dan,
A place I'm working at currently, 'originally' has x3 120 litre Vented DHW cylinders, x1 on each floor, some with no open vent! The one on the top floor serves the kitchen only (yes on the ground floor) and is accompanied by a combi on the top floor that provides the hot water on that level. The place has seen some right clowns.
Scratch my original suggestion. Get someone who knows what they are doing, you'll recognise them when they turn up and puts their head in their hands!
Had a quick visit to the Myson site and downloaded the catalogue, we must be looking at different ones as the one I found presented the info in the same way.
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