There is a renewed push in London for Australians and New Zealanders to be granted special status to live and work in Britain without restriction.
A Commonwealth Exchange think tank report is proposing two-way bilateral mobility zones be established between Britain, Australia, New Zealand and Canada.
The plan is based on an idea by London's mayor, Boris Johnson, who was outraged last year when an Australian teacher was kicked out of Britain while European Union citizens have unrestricted access.
The report argues so-called "Boris bilaterals" should be modelled on the Trans-Tasman Travel Arrangement between New Zealand and Australia.
Since 1973, that arrangement has allowed New Zealand and Australian citizens to enter each other's countries to visit, live and work without the need to apply for a visa before travelling.
Report author Tim Hewish said that arrangement should be seen as a starting point for Britain to build a flexible, fair, reasonable and reciprocal regime.
Mr Hewish argued there was little chance of change before Britain's May 2015 general election but that bilaterals could be up and running within six months after that.