Either that, or the Finsbury Park mosque is no longer useful to them: Anti-terror police raid London mosque.

Geez louise, read this Q&A: North African terror in the UK
:

The reason why a lot of Algerians are here in the first place, why there is a network, is that in 1995 the French anti-terrorist people really cracked down, after a number of bombings in the Metro that were carried out by Algerians that killed eight people and injured well over 100.

Quite a few Algerian extremists sought refuge in the UK.

Britain let them stay here because the authorities didn't see them as a threat to the country, nor did they appear to be breaking any laws.

So they left them alone, and basically ignored them for the first year or two.

The authorities then woke up to the problem, because the French kept insisting these were dangerous people, and started monitoring them.

This from the land that gave us Oliver Cromwell.