[objclxt]

Actually, your own link is contradicting what you're saying! Here's what it says:

"In most cases to be able to claim unfair dismissal you will have to have worked for your employer for one year if you started before 6 April 2012 or two years if you started on or after that date"

Note the bit at the end about the period changing to two years as of last April. This is a new change, if you're not actively involved in HR or hiring you may not be aware of it.