Clacton-on-SeaLabour, the Tories and Lib Dems are all boycotting.
Reform UK leader Nigel Farage quit his seat to re-fight it after a standards inquiry into an undeclared £5m gift, leaving satirist Count Binface his main rival.
The likely August 13 vote tests Reform’s momentum with no mainstream challenger on the ballot.
Sources: BBC, Yahoo, Mirror