Park just off Middleton Lane, the exact same place to park for Trow Water Tower that is also on the map.
Follow the path to the water tower, you may as grab it while you are there, and then keep walking towards Trow pool.
Before you cross the little 'bridge' look to the left to see a kissing gate, go through this to enter the farmers field. Stick to the path and eventually you'll come to an opening that lets you cross the brook and enter another field.
TOAL from here. It's difficult to keep VLOS to explore the whole of the quarry without walking around, so take extra care.
Also be aware of Weston on the Green RAF base nearby which is an FRZ from sunrise to sunset on weekdays only.
Land owner permission requirements unknown.
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Co-ordinates: 51.91721, -1.208668 • what3words: ///leathers.sheets.wakes