It's £32 per module in the UK - regardless of how many modules you sit at once.
It's also a nightmare getting dates as there is still a massive backlog - the CAA will generally take your money and sit on it for a month before giving you a date. Generally it's 3 months between applying for and sitting and exam.
http://www.caa.co.uk/docs/177/srg_el...LandAMC_05.pdf