How do fixed freestyle bikes handle? - OR other bikes for bombing round town!

I have a similar problem, coming from mountain bikes i want something i can ride a long time but want to be able to jump and drop it. Plus i live in Sheffield so no gears will be a ball ache but i don't think anything else will be strong enough, thinking of getting a volume cutter anyway.

Think id rather struggle with no gears for a while until i get used to it instead. I know the hammerschmidt weighs about 1.7 kg and has a significant loss in efficiency so i cant imagine this being much better, i have been looking at the sturmey archer s3x but a guy from harry halls in manchester said it was terrible. Might just try it anyway because that sounds like my ideal set up really, volume cutter or fbm sword with tough but light components, bullhorns and s3x. I have seen a few single speeds around sheffield anyway but its not really the ideal place for them i guess.

Sorry misunderstood you, that my bike has 6 inches travel is what i was refering to. But really i feel getting a mtb for on the road just brings up another set of compromises such as geometry or you end up with a canondale bad boy and really does any one want that?

It sounds like your considering nothing but compromise.
You want to ride all day/long time/distance, get around Sheffield which you say isn't very singlespeed friendly and be able to jump/drop it.
You either need like 5 bikes or to compromise.
And is a trick frame with timetrial handlebars and a 3speed hub that by your own admission is a bit shonky really the least compromising solution you could come up with?
I'd go with a rigid xc type mtb running single front ring and 7-9speed gears on the back and slick narrow tyres.