But there are still some potential safeguards, even if they manage to get away with this -

"In order to claim unfair dismissal, you must have been continuously employed for at least one year. However, you can bring a claim for unfair dismissal within your first year of employment if you are claiming on the basis of race, sex, trade union discrimination, dismissal related to pregnancy, national minimum wage, working time rights, health and safety activities, making a protected disclosure, making an application for flexible working or, where in good faith, you seek to exercise a statutory employment protection right." (From here)

Presumably this would apply within the second year of employment, if the ConDems pull off this fast one.