I didn’t agree to anything unless it was an order. This had the benefit of them requiring to have a senior officer review the request to make sure it’s actually necessary and lawful to order (such as when they requested a buccal swab).

The line-up I mentioned was a photo line-up, where they place one of my mugshots among a group of other photoshopped mugshots.

They arrested me in the first instance, then released me, then arrested me again and charged me after they had performed the photo line-up.