Hi Paul,
Log on to http://www.jetprovostclub.com and get in touch with Eddie Todd. I flew in his JP Mk4 at Sandtoft. During conversation after the flight he mentioned his motor-glider which he flies at Muchamiel airfield near Benidorm. My wife and I found him there and had two glider trips along the Costa Blanca coast. Cost around £50 each, he takes Visacard if you want to keep your euros.
Have fun,
Regards from
Geoff.Charge