Mammogram vs MRI

[DeeUK]

I wonder if some of you could give me some advice on this please..

I've been informed that the hospital will be contacting me soon, for my '1 year post diagnosis mammogram'.

I'm 30, and I know mammograms tend not to be as reliable for younger people.
When they contact me, I intend to ask about the possibility of an MRI, instead.

I'm in the UK, and as far as I know, the majority of hospitals only offer mammograms. I have a feeling they're going to refuse to give me an MRI.
If they do refuse, I'm prepared to pay for it myself, if it's going to have a better chance of picking up any abnormalities, than a mammogram would.

I could do with a little guidance on this, so I'm armed with some information and knowledge, to face the medical folks with.
I'd really appreciate any help, advice and info, anyone may be able to give me