Sergeant, Royal Artillery: The printed gun badge above the stripes confirms and the shoulder title is just about visible at the top of the seam. Late war pic as he has four service stripes on the forearm. The AA Command is the alternative curved bow as well (I've never found definitive dating information) - the other pattern had a curling bow. http://miliblog.co.uk/wp-content/gallery/cloth-brit-ww2-anti-aircraft-formations/anti-aircraft-command-embroid.jpg
They stayed in the UK. The insignia top-to-bottom is: 'Royal Artllery' shoulder title - fairly self explanatory. 'Anti-Aircraft Command' unit badge - to denote someone on home AA duty as they didn't leave the British Isles. Blue-Red 'Arm of Service' strip - indicating Artillery as the service he served in. 'Gunnery Qualification' badge - positioned thus, it indicates he was an instructor or Battery Serjeant i.e. fairly well qualified to lead a battery of guns. Serjeant's Stripes - again, self-explanatory. 'Service Chevrons' - red on a khaki background, indicating that this man served 4 years as each denotes a 12 month period of continual service. Instigated from 3rd December 1939 and authorised from 14th February 1944, dating this picture quite nicely to the October 1944 displayed below. Hope this helps.
To save me typing in info on about Harry the see following link for information http://en.wikipedia.org/wiki/Harry_Medhurst