Only sunni bangladeshi masajids in UK are those affiliated to fultali group (based on my limited knowledge). There's one near my workplace where I go for jumuah salah and they even recite salaam after congregation (apart from kissing thumbs, celebrating Milad etc.). There's hearsay that fultali group has never completely disassociated itself from deobandis.
Are these people Sunni. They do Mawlid etc as one can see from the profile picture http://www.facebook.com/HazratAllamaFultali But here comes te chain 32 | Hadhrat Mawlānā Shah ‘Abd’ur Rahim Ad-Dehlawi Rahmatullahi ‘alaihi 33 | Hadhrat Mawlānā Shah Wali ALlah Ad-Dehlawi Rahmatullahi ‘alaihi 34 | Hadhrat Mawlānā Shah ‘Abd’ul ‘Aziz Ad-Dehlawi Rahmatullahi ‘alaihi 35 | Hadhrat Mawlānā Sayyid Ahmad Berelwi As-Shahid Rahmatullahi ‘alaihi 36 | Hadhrat Mawlānā Shah Karamat ‘Ali Junpuri Rahmatullahi ‘alaihi 37 | Hadhrat Mawlānā Shah Hafiz Ahmad Junpuri Rahmatullahi ‘alaihi 38 | Hadhrat Mawlānā Shah Muhammad Ya’qub Badarpuri Rahmatullahi ‘alaihi 39 | Hadhrat Mawlānā Shah ‘Abd’ul Latif Al-Fultali Rahmatullahi ‘alaihi 40 | Hadhrat Mawlānā Shah Imad Ud-Din Al-Fultali Daamat barakatuhum