[doctorjames]

One option depending how brave you are feeling would be to shoot later in the day with much less light outside. Basically its a contrast/exposure issue:

A long enough exposure to show the detail inside will completely over-expose the outside.
A short enough exposure to show the outside will completely underexpose the inside.

I know this sounds like im teaching grandma how to suck eggs, but its really simple thinking that often works in photography.

Now... you can try and illuminate the inside with flash, and even with two its going to be difficult to get your lighting right, as there is no 'subject', just surrounding walls. Flash kit that you are going to cart all the way into the field is unlikely to give you a non-direction feel, instead you need even illumination.

Now this is where the bravery comes in (and a tripod). A slow and steady lightsource, like a torch latern (or even candles if you want to really push the boat out) as opposed to the impulse of flash, positioned centrally, but out of shot will illuminate the inside. Wait until it is dark enough outside and you have good balance between the two, choose and appriopriately long shutter speed and voila...

The cons of this are obvious.... out on the moors at dusk, needing another lightsource and if you wait to long you will end up with no light outside (well very little unless the moon is out)

The pros:... Usually a menacing look to the clouds because of the long exposure, an evenly illuminated interior (provided the light source is equidistant from the corners, and ideally not ON the floor), and often a gentle softness to the exterior detail without it being out of focus.

Just a thought, ive tried similar before, some have worked very well, others have been appalling, usually through my lack of patience.