Krav Maga interests me, but it's rather expensive 
Think Linzi pays £20-£30 a month and that's for 4 x 2 hour sessions 
She really enjoys it mind and some of the stuff they teach her is

That's not bad. Some of the internet prices quoted on their websites is mad.
It's pretty lethal stuff, it's used by the Israeli Special Forces.
Essentially alot of it is similar to ju jitsu.
I pay about £10 a week and get 4 hours training, but i also get extra training most weeks at mine as well.
The problem with most martial arts is it's all about making money. My club is certainly an exception.