Hellow and welcome, as has been said i run a Falcon 27 at the moment, twin mercruiser diesels, it,s very good on fuel and if your feeling the pinch you can always turn one off on long cruises on the broads(port on mine as starboard does the power steering),turning the other on for mooring. Food for thought, long way off but how about this? http://www.boatshed.com/falcon_27-boat-163512.html ,
The only reservation i would have with the single would be mooring, more difficult as Facon hulls are sports cruisers, and as such get blown about in the wind at slow speeds. The boat your looking at is not a pure Falcon boat but was built using the old hull mould ,but different moulds for the interier(better use of space imho).
For the broads use only go for the single, if you buy a twin , you have the ability to poke your nose out of the piers at gt yarmouth