Johannes, sorry about that!!
awemawson:- The riding bit has long been gone in local government use but yorkshiremen of a certain age still use the term, as you may well know the term riding is derived from the word thirding or third. This is why there was a west, east and north riding but no south riding.
Probably to create more administration the county was carved up into four parts north,south, east and west yorkshire and is as it is now. Somwhere along the way we then had north humberside creep into the equation and n. humbs resides in east yorkshire. All a bit confusing
Sorry to have rambled on.
regards
Dave