You need to provide your Swiss banker or paying agent with a declaration of intent to claim the remittance basis in advance of the start of the new tax year. This means that for the forthcoming tax year 2014/15 you need to submit a declaration by 31 March 2014.
Additionally, you need to provide your Swiss bank or paying agent with a certificate from your UK accountant or tax adviser that you have claimed the remittance basis of taxation.
The deadline for 2012/13 declarations is also 31 March 2014.
If in any doubt about what you need to do please speak to Phil Moss or Clare Munro as soon as possible.