I wouldn't delay for another year either.

I'm in a similar situation, but only for 3 weeks, not 3 months. My DS starts reception in September and were coming home for a holiday/wedding in October. We're only 'allowed' to have 10 days off during term time and any longer I think we'd be expected to follow the curriculum on our trip. Which I wouldn't have any issue doing to avoid DS being left behind. He's already an outsider so don't need any more attention drawn to him in a negative way. He's also really self conscious, so wouldn't want him to not be able to read when everyone else can.

I really think 3 months wouldn't impact too greatly depending on the child and how much time you're willing to put in on a holiday.

Hope you have a great time! Sunny in the UK today.... Top of 19!! LOL