The operation to police the badger cull pilot reached its full capacity at 8pm this evening, Gloucestershire Police said.
The force has said that the operation will be "operationally independent, impartial, even-handed and fair to everyone whatever their views, interest or involvement in the pilot scheme".
A document outlining the role of the police says it will mediate between parties if there are any protests as well as "responding to any breach of the peace".
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The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.
There will be some brightness, with the best of the sunshine towards the south and southeast where it will again be chilly.