Need some efficient solution of district range selector for an area in UK. Lets say I selected Manchester which covers many small districts like M1,M2,M3.....M20, M30... My users can be sharing responsibility of some of the districts of Manchester like from M1 to M10 and another user with M11 to M21. Also they can have multiple areas like Manchester(M), Aberdeen(AB) and so on and the range will be needed even then.
How to develop the interface for it so that it should create minimum load on mysql DB as well as handy for user to add a lots of areas with their desired district range.
All selected range postcodes will be added in DB and postcode info will be matched against each one so that the person responsible can be referenced.
For more idea: http://screencast.com/t/6qwCVhKA
thanks in advance