Just thought I'd mention this as it's probably of use to others. When I got my big screen recently - it looked as if I was going to spent a fortune on top on a decent wall-mount. I found this one, which has all the features (it bolts to the wall, and it tilts!) you need. It also comes with lots of fittings for a few types of walls - plain old brick/concrete is certainly covered so you won't need anything else.
Postage also appears to be free.
Adjustable Wall Bracket
for Large Plasma and LCD Screens
A heavy duty, metal flat panel wall support
for large Plasma and LCD screens.
Suitable for 30" - 63" wide screens
Tilt (±15°) adjustment
75 - 480mm fixing holes
Mounting depth 10 - 140mm (75mm parallel)
Compatible with VESA mounting patterns
Complete with fixing accessories
Dimensions 820 x 225 x 17mm
Maximum load 75kg