Holidays, Payment-in-lieu and redundancy

I worked for a company that operated a Flexible benefits scheme which allowed employees to increase their holiday allowance. I was TUPE'd to that company 6 years ago and by the terms of my original contract I was entitled to 28 days holiday, which I have always used.

The basic amount under the Flexible benefits scheme is 20 days and their HR dept regards any days holiday above this as being a 'benefit' and have removed the amount they allocate to holidays in my reference salary from my payment in lieu of notice. I regard the 8 days extra as a contractual entitlement as I have never signed a new contract with them and am still under the T&Cs of the contract I was TUPE'd on. Does anybody have any advice on this please?

Thanks in advance.

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Well, I've just received an e:mail from the HR rep of the company in question asking if this constitutes a grievance and if so , to put it in writing. I'm very surprised by this as, as far as I can see, either my contract does state what I believe it does or it doesn't. Either way its very easy for them to check without going to such bother. Are they just trying to shut me up?