There appears to be a lot of useful information on the mix of transport types used in various cities across the UK and Europe (with a few others worldwide) which is documented at http://epomm.eu/
In particular there is a map based interface that lets you compare various cities. Derby isn’t included although Nottingham and Leicester are. See http://epomm.eu/tems/index.phtml?Main_ID=2928
Some of the jargon is hard to get through but I think there is probably a lot of useful information here if you make the effort to plough through the jargon.
One question (which I can’t answer) is why Derby isn’t included.
Birmingham and Manchester are also excluded. I wonder why?