employment changes restrict earning.. legal?

[aaronseasear]

I am employed by a large private company and paid on a salary and commission basis.
I have been advised that my job is now being scrapped, and all they can offer me is a position with the same basic salary but with nowhere near the means of earning the same in terms of commission.
my previous position was very profitable to the company, but they have decided its not the direction they wish to go.. fair enough
is this legal? can they just change my job and reduce my earning potential.. would i have a legal case?

[terambulan]

Have a look at your Contract of employment......you must have one

[thugulike]

This would be a fundamental breach of contract and you could resign and make a claim to tribunal. Or, they could make you redundant if you had qualifying service. A rough estimate of 20% reduction in earnings could constitute a breach of contract.. You would need to look at the terms of your contract though.

[aaronseasear]

Many thanks
I have a contract, but of course it is very vague, you are employed, you will be paid a basic and commission ect ect....
My thoughts are that surely irrespective of a vague contract, the fact that the job i have been doing for the past 3 years has earnt me an average of X and that has now been reoved for no good reason is challengeable by law?