Human Protection League

Early in the 1970’s an official committee was founded to determine how to handle the "mutant problem” that the United Kingdom had suddenly. The committee was disbanded within a year over positive Parliament reaction to events elsewhere but several key members of the committee maintained that mutants were a threat to the general public and bound together.
The three members of the houses of lords took a darker turn than they expected in the creation of a sentinel program and creation of anti-mutant legislation despite the best efforts of MI13 and other pro-mutant organisations. They operate to further their own political plans under the cover of protecting humans with little regard to the age of the mutant.

Sherwood Rangers

As the cold war neared its end at the top of the 1980s a lot of countries turned inward to try and figure out how to deal with their domestic problems. The growing mutant population was certainly a topic of contention among the ruling parties of government, and they openly debated the possibility of registration and control. When brought up the more vocal elements of the Mutant community spoke up against it, comparing it to fascist regimes in the not-so-distant past and arguing that this sort of discourse seemed to fit more with the powers that be behind the iron curtain.
Some of those louder voices radicalised and splintered off from the more peaceful diplomatic approach some of the older leaders had. A prominent example is the Sherwood Rangers, a small group of mutants that claims that the established elite would take everything from them if they were unopposed. So under the guise of one of the United Kingdom’s most well-known folk legends, they banded together, and in early 1992 they started to take aggressive actions against known anti-mutant legislators and organisations.

MI13

MI-13 is the latest in a long line of British intelligence agencies dealing with "weird happenings" within the United Kingdom. It followed the likes of Special Tactical Reserve for International Key Emergencies (S.T.R.I.K.E.), Resource Control Executive (R.C.X.), Department of Unknown and Covert Knowledge (D.U.C.K.), and the Weird Happenings Organisation (W.H.O.).
It evolved from the remnants of W.H.O and now holds under it all paranormal organisations and has rationalise them into a single department as of August 1988. It often clashes with other intelligence agencies, including MI6 who wish to have jurisdiction over "weird happenings" and believe all the specialist groups like MI-13 are doomed to fail.