Oh I think you're quite safe BM. 
I've dug this hillarious Wikipedia link out for you. If you scroll down to the section headed "Minor far left political parties in the UK" you'll get a taste of 'the family' and you'll see what I mean. If you click on any of the names, you'll then get a brief history, which underlines the fractious nature much better than anything I could produce.
You only need to read a few to get the general idea of splits, mergers, factions, egotistical maniacs, expulsions, more splits and more mergers, the odd break away here and there, a few more splits etc It caused me a degree of amusement as I was reading it through, and some of minor references contained within them, along with some of the coded references to individuals.
About half of the parties mentioned are Trotskyist in origin (and then there's a whole sub-layer of groups, societies, or associations lurking even below this strata) I've personally struggled with Trot groups as I find them to be disingenious cuckoos (a bird that doesn't build its own nest, but rather tries to take-over someone elses) which is the classic 'entryist' Trot tactic of choice, and did so much damage to the Labour party in the early 80's of course. I remember attending the first meeting of Leicester's SLP, when someone asked from the floor if they could join the party and also be a member of another? :suspect: I think half the room reached for the nearest ice axe, :laughing: as everyone seemed to recognise what this meant, and the need to remove a troublesome Trot before they started doing damage etc (in truth we can do enough damage to ourselves and don't usually need Trotskyist assistance)
FWIW, my own affiliation to the SLP came out of International Leninist Workers Party (whose existance the link does acknowledge 
), as we're talking seriosuly minority groups here. I used to take a copy of the Economic Scientifc and Philosophical Review which the link also refers to although I must admit to having not read anything they've put out now for about a decade though.
http://en.wikipedia.org/wiki/List_of_polit...litical_parties
