I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Parking can be found, outside of the peak "no parking" times along the edge of the road leading into Thames Valley Park, there's also public parking at the Regus office
Thames Valley Park (TVP), located in Reading and was developed in the 1990s on the site of the former Earley Power Station. it spans over 200 acres and includes a variety of different habitats, including wetlands, meadows, and woodlands. The park, water meadows and the 80-acre waterside nature reserve was developed to create a natural flood plain to protect the commercial development, improve natural habitats and increase local biodiversity.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 24/01/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.