Be aware there is a catch with the countdowns. You normally are allowed 6 weeks per year holiday/illness, but you don't get this with a countdown unless you give exact dates before you pay for it. Their terms and conditions don't state this, but you will have to pay if you miss a week unless you book it off before paying.
This applies to classes which have been computerised (where you get a little credit card sized card).
It may be better just to book a 6 week countdown - you get 6 weeks for the price of 5.
Annie