Tigerfairy - chickens are really easy to look after. All they need is food and water daily (much more of both than you would think for their size), poo tray in their bed area needs cleaning out about fortnightly and we move the 'eglu' to a fresh patch of grass about fortnightly.
As for the vet visits - we felt pretty stupid about it - 30 minute drive to suitable vet (our local one didn't do birds) - how much would it cost? - was it worth it for just a chicken etc? Anyway pleasant surprise as vet took it all very seriously, prescribed appropriately and all up paid I think less than £20. (£10 for consultation). Not bad I thought.
I think the eglu is pretty well fox-proof. It is quite heavy to move. The bed area is a completely enclosed plastic capsule so has no access underneath. To open the door from the bed area into the run you lift and turn a knob. To open the front of the run there is a wire stake threaded through two loops and pushed into the ground. The sides of the run (strong wire) extend about 10 inches to lie flat on the grass all around the run which makes it difficult for anything to get in that way.