A 20 mile radius of the HS1 postcode only brings up 16 frequencies
https://radioreferenceuk.co.uk/frequenc ... 1&range=20
The Coastguard when tasked will use 156.000, maritime safety information broadcasts will be on marine channels 62, 63 or 64 depending on which serves your area. Firefighter handhelds will likely be 457.0375, I think Scotland is still on NFM. Basically everything on the island is between 144 and 463. I'm not sure how many will be using private mobile radios on 446 - 459.