From Dover's core strategy on housing -
"Housing allocations are expressed in terms of the number of new homes to be provided. The Strategy seeks to allocate land for up to 14,000 homes and to deliver a minimum of 10,100 of these by 2026 as required by the South East Plan. Of the 14,000 homes, land for 7,750 is allocated through the strategic allocations and the saved Local Plan provisions for Aylesham. Land to accommodate the balance will be allocated through the Site Allocations Document. "
So there's 3,900 more homes allowed for than are required, and that could be available for any increased need due to immigration.
The 170 or so pages of the South East Plan dealing with land allocation can be found in section B here -
http://webarchive.nationalarchives.gov.uk/20100528142817/http:/www.gos.gov.uk/gose/planning/regionalPlanning/815640/
As far as I'm aware it's not available on Sky News
