Thank you Ela,
I unfortunately have to rent, and so it is going to be hard enough to keep the stray. Also she herself (the stray) is terrified (with good reason!) of the feral cat, and prefers to face my non-cat-trained dogs rather than stay in the garden if the feral is there -it is how I always know when she is here, as the little stray 'tells' me!
She is the biggest bravest feral I have met, and in fact my landlords next door have never seen her, no one has except me, and she does not come to feed if any other human is around, so I have always fed her when there is no one on the farm but me.
Even then, if I move too quickly, or make a noise, she is gone.. Many of the ferals I have seen in other places have been more like my stray, just tame cats gone wild - but this one I am sure has never been anything but wild. Would it really be OK to take her away from a place she has lived all her life - she is not young, and she has always been , until the stray arrived, the only cat here.
IF I thought it would be best for her, I would find some way of getting her to you. I wish you could see her for youself, it is hard to describe her in a post!