I've got one of these which is great, but US made so not sure how easy they are to find http://www.schroedercabinets.com/mini12+.htm
I used to walk with bass and head on my back and carry the cab to the train station.
Actually you can borrow my rig if you want as it's getting dusty.
dooks, look at mark bass. I've got one of their heads, 250w, carry it in a gig bag it's so light. Think you can get one for around the £200 area.
As for cabs this guy is uk based and very good and light apparently
http://barefacedbass.com/
I've got one of these which is great, but US made so not sure how easy they are to find
http://www.schroedercabinets.com/mini12+.htm
I used to walk with bass and head on my back and carry the cab to the train station.
Actually you can borrow my rig if you want as it's getting dusty.
Or for second hand you can go wild here
http://basschat.co.uk/forum/20-amps-and-cabs-for-sale/
Or even better do as Soil and Pimp did when I saw them some years ago. Upright bass through a Vintage SVT head and 8x10 cab. BIG.