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As promised, more photos here - My Mother took bury photos, this one shows the weathering one month on the best:

You might want to check the weight of them though, trying to get a heavy rubber ladder over the ridge could be an issue?

As chair of governors at a school I once had to source school uniform suppliers!

I've looked at rainwater instead as its easier to process. Filter at the gutter to get all the big stuff out - we have trees so gutter hedgehogs are a no-brainer Filter at the downpipe to get the sediment out - Wickes do a really good settlement style filter Buried IBC tanks under the patio to provide a lot of storage and settlement for fine silt (tank 1) Final filter at the tank is then on the pickup for the pump - can be backwashed if needed without opening the tank. Jet Pump with an auto switch to provide the pressure into the house sat behind a 5um filter and a charcoal filter No automated top ups to the tanks, just a simple level switch in the tank and a hose into the closest downpipe gully Total additional cost for that lot is about £400, equates to saving around £130 of water a year so it has a short payback for me.

no pressure lol. If the manifold is the other side of the house then the pipe runs may be too long to do it that way. You might have to run flow and return pipe work now in anticipation of fitting a dedicated manifold for the new room. What size would the room be? Probably looking at two loops for that room as it'll have quite high heat loss during the winter / bitter parts of the year. If you had say 2x 70m loops ( pipe at 100-120mm centres ) then you'd have 15m of tail. Would that get you to the proposed main Ufh manifold? Also, if you can get to the manifold without exceeding 100m pipe loops, don't forget to run cables for the thermostat in that room as it'll need to be stand alone from the rest of the house. Point 1) yes Point 2) pointless endeavour .