Hi
Browsing through and found that I have same problem/situation as you encountered: GF pug/biscuit mix with the FF and SF using aluminium spreaders. Supplier suggestion: manifold with 6 loops on the GF, 4 loops on FF and 2 loops loft conversion. Did you go ahead with the above configuration? Did you use manifolds only on GF and loft (going down for the FF)? Any suggestions appreciated. Same as you, I would prefer only 2 manifolds (1 on the GF and second in the loft as there is plenty of room under the eaves...). It should not be any problem with airlocks and the length of the FF loops will be max 75m. Cherry on the cake: it costs less...
Or should I just listen to the supplier and get 3 manifolds/pumps, etc? I know they need to sell, but not if I can find a better/easier/cheaper way.
Any comments?