Would switching all the produce provided through the SFVS to organic lead to more food miles?

At present approximately 30% of the produce for the SFVS is sourced from the UK. PAN UK is advocating that, where possible, more of the produce is supplied by UK organic growers. For example, at present, some of the apples and pears supplied to the SFVS are sourced from Portugal and Belgium. Sourcing them all from the UK would help to reduce food miles.