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It’s an LMT assault rifle, most likely the CQB 10.5 SBR with custom rifle butt and an EOTech sight. A lot of police units in the UK are using this rifle, or variations, and I believe they were ordered by the Ministry of Defence as a bulk buy, so similar rifles are likely in service with UKSF.
The yellow paint is either for identification, visibility or training purposes. They’re police so I doubt they’re trying to remain hidden or concealed.