https://www.4g.co.uk/4g-frequencies-uk-need-know/
All 4 of the operators in the UK operate at 800MHz.
EE
800MHz (4G) 1800MHz (2G & 4G) 2100MHz (3G) 2600MHz (4G)
O2
800MHz (4G) 900MHz (2G & 3G) 1800MHz (2G) 2100MHz (3G)
Vodafone
800MHz (4G) 900MHz (2G & 3G) 1800MHz (2G) 2100MHz (3G) 2600MHz (4G)
Three
800MHz (4G) 1800MHz (4G) 2100MHz (3G)
All 4 of the operators in the UK operate at 800MHz.
EE
800MHz (4G) 1800MHz (2G & 4G) 2100MHz (3G) 2600MHz (4G)
O2
800MHz (4G) 900MHz (2G & 3G) 1800MHz (2G) 2100MHz (3G)
Vodafone
800MHz (4G) 900MHz (2G & 3G) 1800MHz (2G) 2100MHz (3G) 2600MHz (4G)
Three
800MHz (4G) 1800MHz (4G) 2100MHz (3G)