British power pilots, contact the British Gliding Association to find the winch launch club near you...you will be pleasantly surprised at the relatively low cost of this experience.
My very limited experience - some of us from a power club visited a gliding club for an evening - is that that there was no "relatively low cost". We spent an entire evening at the field - interesting in itself, and fine on the occasion as I had nothing else to do that night - in order to spend just a few minutes in the air at a
cost per minute that was not noticeably different to powered flying.
...alas, most power pilots are more entranced by the array of instruments on the panel
Ah well, at least for my few minutes in a glider I was actually looking out of the window - I never even noticed whether it had anything much in the way of instruments (apart from the piece of wool)!