Hey Hexalobular + Toadrunner,
Thanks for the input, I left the game afked for a while and they've seemed to despawn (still have Bad Omen tho). I'll drink some milk when I get time to jump on again.
Notes: the wiki states the following on the Bad Omen: "Bad Omen is a status effect that causes a raid to appear if a player is in a village."
I thought that'd entail me having to actually live within the village limits to occur.
Secondly I was mistaken, I read from a Reddit article on r/minecraft (https://www.reddit.com/r/Minecraft/comments/btmh1f/ominous_banner_effect/) where the responder states that:
"The banner dropped as an item on the ground will attract illagers from a pre-existing patrol, who will try to pick it up and start carrying it. AFAIK it doesn't influence illager spawning, just makes whatever illagers spawned naturally to pathfind to it.Hanging/standing (placed) it should have no effect whatsoever."
Anyway, thanks for the help in the end guys.