changing margins in article class when using Beamer

[Graham M Smith]

I'm using Beamer, and producing a presentation handout by switching to 
the beamer article class, which defaults to wide margins.

If I change the margins in documents settings, this then prevents the 
beamer slides being produced (I get a compile error). I assume I can put 
something in the preamble that will switch the margins for beamer 
article only, but don't know what this might be.

Can anyone help with this?

Many thanks,

Graham