Nosha - sorry about the delay - just needed a swat a irritant fly and find a couple of guidances bits for you.
I think you are just about right, but go gently at it. The notice that your employer would have to give you is one week per complete year of employment - which is at least 9 for you - not whatever your CoE says (three months??).
It's valid tactic for you to start the request for 'consultation period' - 'Hey, boss, don't you have to discuss this with me first - not just change my T&Cs?' That should use up a few weeks.
Look at this - and the feed link from it about Diagreeing with changes to your employment contract'.
http://www.direct.gov...onditions/DG_10028079
DirectGov stuff is written in simple language.
right.