99p for a 300ml tin. Far cheaper than branded alternatives.
I've been using this stuff, which is their engine degreaser, on my drivetrain and it's been excellent: http://www.lidl.co.uk/uk/home.nsf/pages/c.o.20090310.p.Engine_Cleaner.ar11
The top one is chain specific though. The nozzle on the cans is actually very good as it's a jet rather than a spray which makes it far easier to direct it exactly where you want it, with less wastage.