Salam it is possible that you will not find any members of the sanusi tariqa in london if that is the case you could try and observe (for yourself) the activities of the naqshbandi mujadidis, they have quite simple activities typical dhikr, and muraqabah silent conetmplation and remembrance of allah (dhikr of the mind/heart). you probably wont find anything funny or objectionable in their actions. look for shaykhs who are the students of shaykh zulfiqar ahmed naqshbandi, and observe the activites of their tariqa....then you will beable to decide for yourself if their actions are inline with the sunnah ...etc. most of all if you ever feel that a shaykh tariqa is doing something questionable ask them about and enquire so you know the facts straight. just some advice. Also i would request you to listen to this series by shaykh hussain abdussatar, an islamic scholar and a pathologist, also a student of shaykh zulfiqar ahmed. one of the interesting things about him is that he rarely or never uses th terms sufi, sufism because they are loaded terms and desires that people judge him and his tariqa based on what they observe and not based on the actions of a so-called sufi prostrating to a grave or whatever... http://www.sacredlearning.org/tasawwuf he talks about the degeneration of tasawuff in these talks and how 95% of all those who claim to be sufis have very little to do with the original sufis (i.e. the first phas eof sufism as mentioned in the youtube lecture mentioned earlier). i think salafis in general would have very little to fear and would appreciate tasawuf as shaykh hussain teaches it. in the final lecture of the series he talks about how he found his shaykh (aulfiqar ahmed) and how at first he was sucked into a tariqa which though outwardly had some good characteristics was in reality part of the 95% of "sufism" which has nothing to do the original sufism (i.e. junaid baghdadi)