Please note that for some constituencies in Wales (and in England), the ONS has had to use electoral registration data from 2022 as an estimate of electoral registrations for 2023.
Sylwer, ar gyfer rhai etholaethau yng Nghymru (ac yn Lloegr), fod SYG wedi gorfod defnyddio data cofrestru etholiadol o 2022 fel amcangyfrif o gofrestriadau etholiadol ar gyfer 2023.