The 24 month rule can also apply if you change location, if the difference in travelling time will not be significantly different. E.g. if you have an 18 month contract in a central London bank and then follow it with a 12 month contract in another central London bank which is located on the same road the 24 month rule will apply at the start of the second contract.
http://www.hmrc.gov.uk/manuals/senew/SE32280.htm
HTH
http://www.hmrc.gov.uk/manuals/senew/SE32280.htm
HTH
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