In Hampshire. This tree produced well last year, but this year the few blossom that set got no further than one inch big apples, the few that then survived being nicked by the squirrels!

It looks healthy enough (sorry, I don't know the variety, but it's about 3m tall and produces medium sized, red and green apples) and I know some apple trees produce well in alternate years. It has loads of new shoots.

Can I get stuck in a give it a reasonable prune now or should I wait til the 'correct' time, after the (non-existent!) harvest?

Thanks.