I've flown at Weston on a few weekends. Gliding would be active, winch launching with cables up to 2,000 above airfield. Weather permitting.
Assume you would like to fly to photo your housebuilding, how distant is that from WOG? And what aircraft would you be flying? If 500' or lower and not near the airfield, very unlikely to encounter glider traffic. If weather is good for cross country soaring you may find gliders ANYWHERE, but if they are 500 feet or lower and not near an airfield, they would be getting nervous.
Soaring weather is bumpy. Typically marked by fair weather cumulus clouds.
Employed by gliders from 9 am to 7 or 8 pm to gain altitude, which is why they spend their time going around in circles.
They are unlikely to answer radio calls. Telephone in the morning is better.
Do not assume because nobody answers the phone that nothing is happening.
Probably everybody is out on the field, or in the air.