AA, that's good. Thanks for the info back too. As I get further into the wireless situation I 'm finding that I can get along quite well as it is. My mis-spent years as a Ham (G0??? and VE6???) help a bit. I'm interested in the power output comparison.
Fobs Folly is an ancient Victorian/Edwardian edifice with exterior and interior brick walls throughout and high ceilings of about 9ft. Not very big (in number of rooms) and on two floors. It's the slant angle of communication that tests the range. 2.4GHz travelling at right angles through a brick wall doesn't attenuate too much. But at 45 or 60 degrees attenuation naturally increases geometrically. Remember it's the attentuation with range alone that helps to Wireless Networking so successful and helps security. Otherwise there's be a lot more Network clashing.
One final point that you can read in the D-Link blurb but in case you miss it; you'll be told to load the software before plugging in the hardware. Also when configuring the Wireless Network be sure to un-check the box that says "allow Windows to configure my Wireless Network".
Keep us posted on the final result.