@The Wee Bear nimdy does say its 10601 in their first post, so I think you're right
Its a classic Phase 5 streetworks site, and is very more than likely to have only B3+20 (so no 5G), it
might not even have B1 re-farmed yet either.
It also doesn't have a GPS antenna sticking out the side/top so it wont be EN-DC enabled either and therefore it can't act as the 4G anchor for a 5G connection (5G from another site).
As for the original question, if that site is the 'default' connected then it
should be possible, providing the router hardware allows, to force using band-locking to connect to a more distant B1 (North West of Campton village
https://goo.gl/maps/sa5Sb3dSU6fC1Jct7, or South East of Shefford
https://goo.gl/maps/mS5FMaBcLXRwbVZJA) or B28 site (South of RAF Henlow
https://goo.gl/maps/q8y8PceWrT1Pjy7F9). But none of that guarantees a 5G connection.
My guess would be that only the RAF Henlow site would have 5G of those three, as it has B28 logged on cellmapper and the others don't, though North West of Campton also seems to have B32, so that might perform quite well even without 5G. New photos of the sites would help try identify the antennas - some streetview pictures aren't newer than 2009!