I have the ctek, don't know which model but around £59.00 from Brands Hatch Morgans, great product. On my other Mog I have a Lidl £14.00 conditioner that I have to connect to the battery with crocodile clips, works just as well IMHO.
1969 4/4 1995 plus 8 1996 Plus 4 4seater 2002 Aero S1 2013 M3W 2014 Plus 8