I've 'experienced' 3 glider pilots taking to their 'chutes from an ATC point of view.
1. Farnborough based aircraft south of Basingstoke advised us he'd seen a glider fuselage descending ahead of him with the wings fluttering down nearby, and the pilot on his parachute descending too. We alerted Odiham who had a Puma in the circuit. The Puma picked up the glider pilot before he had chance to gather up his parachute and took him to sick quarters at Odiham.
2. During a competition at Lasham, a tug called to advise us there had been a mid-air collision. Once again we asked Odiham helicopters launched a search.
3. When gliding was still allowed at Farnborough, the club caravan called ATC to advise one of their aircraft appeared to have had structural failure and the pilot had parachuted out. In fact it transpired it had had a mid air with a C152 transitting adjacent to the ATZ.