As will many others, but it would help if you could indicate which part of the country (or world) you'd like to do this.
You could also download
this document from the CAA website which lists all FTOs approved for instructor training (1.3 MB)
Below is the list of approved organisations for JAR FCL 1 FLIGHT INSTRUCTOR ASSOCIATED ADDITIONAL QUALIFICATIONS (AEROPLANES). Contact details of each of them are in the CAA document referred to above.
Aeros Flying Club
Aerotraining
Andrewsfield Aviation
Anglian Flight Centre
Atlantic Flight Training, Coventry
Bonus Aviation
Bournemouth Commercial Flight Training Centre
British Airways Flying Club
C & S Aviation
Cabair College of Air Training
Carill Aviation
Comed Flight Training Limited
Coulson Flying Services
East Midlands Flying School
European Flight Training Llc
The Examiner Training Agency
The Flight Centre
Flight Pass Limited
Flight Training College (UK)
The Flying Hut, Shoreham
Goodwood Flying School
Horizon Flying Club
Jersey Aero Club
HCS, Babcock Rosyth Defence Limited
Leeds Flying School
Leicestershire Aero Club
Manchester Advanced Flight Centre
Mann Aircrew Development
Multiflight Limited
Old Sarum Flying Club
On-Track Aviation (at Oxford and Wellesbourne)
Oxford Aviation Training
The Pilot Centre, Denham
Ravenair
Redhill Aviation (Redhill & Shoreham)
Rural Flying Corps
South Eastern Aviation
Southend Flying Club
Stapleford Flight Centre
St George Flight Training
Tayflite Limited
Tayside Aviation
Triple A Flying Limited
West London Aero Club
Wycombe Air Centre