Thanks for your swift response PMM.
Just to clarify. We get a Bank Cheque from our bank (HSBC) made out in Canadian dollars and made payable to 'Receiver General for Canada' and send this to London along with our updated paperwork?
Don't understand this bit 'The name of the Canadian bank that will pay the Receiver General for Canada will be written on the cheque.' or who issues the receipt.
Sorry if these are silly questions! Just want to get this right first time.