Bristol is also a slightly soft target because (a) maybe due to the Sustrans influence, it has a lot of existing facilities like ASLs and (b) it has a large student population who may* be young, poor and fit enough to cycle.
On the other hand, the climate is atrociously wet, unlike Hull or Cambridge.
*although yer average Oxbridge-reject Bristol student probably has a new car purchased by the Bank of Mummy and Daddy.