@Stuart *****
keep in mind - any application 1-year extension you get out of a 90-days Non-Imm-O Family visa will need to be annually repeated, and the extension will begin on the day when the initial 90-days stay permit expires. And you will keep this date in the coming future. So if you maybe plan to spend summer months back in merry ole England, you should time your extension application to fall into the months around New Year which you definitely will spend in the sunshine