Thanks for the replies folks.
Seantheman, you seem to have done exactly what we are planning to do.
Our house is coming down with pine at the minute, there's too much of it, its everywhere. This is why we got the idea, and it sounds like you are glad you did it.
Would you have any photos of the finished job?
We are also thinking of painting all our internal pine doors the same colour too. We did one as a trial in our ensuite and it looked a lot better than the plain pine.
Our stairs currently are open, the previous owners had carpet on them but we pulled it up, it was filthy. We can't decide whether to paint them too or put a line of carpet up them. Don't think I would like to carpet the landing. It will be an office space and will soon be getting shelving put up, so I would like to keep the floor as wood. Do you think painting it the same colour would be a little OTT?