Recommend a Wall mount

If your setting up the bracket on a plaster wall check to see if you have studs in the correct places otherwise you'll need to brace it.

I would take a stab in the dark and go with Plaster. To find your studs knock on the wall and listen for changes in sound. Then measure the distance and make sure it's all good ( should be 450mm I think)

When I was putting my wall mount up my studs were too far apart and had to end up placing timbers against the plaster.

The one you chose seems fine.

That bracket seems decent enough, If you're ok with the price then I would go for it, i know brackets could be had for a lot less, but then you begin to sacrifice quality. Honestly though, a cheap flat/tilt bracket shouldn't be much concern on a 40"



Edit***

Do this at your own risk, you can cause serious problems if you puncture pipes or electrical wires hidden in your walls, and you can shock yourself if you don't take care when working with electrical outlets...

As for mounting. i would recommend a couple of things...

1st get a stud finder, it senses where the studs in the wall are.... it is best to grab these when mounting the TV to the wall for best stability.

OR

I recommend finding the closest electrical outlet or cable outlet in the wall. Remove that plate and the take a flat thin screw driver, and slide it into the wall between the sheetrock and the box, if you do it in an electrical box i would recommend shutting the power off, but generally these are mounted directly to a stud, so you will be able to feel which side the stud is on. So if you slid the scrw driver into the wall and stopped quickly the stud was on the left side of the box... in the US studs are 2x4 which measure 1.5" x 3.5". So if you did use the electric box method, and find the stud right next to the box, measure over .75" from the edge of the box and you will be pretty close to the center of the stud.

Next determine what the stud spacing SHOULD be for your house, generally building codes will tell you, and measure over from your 1st marked stud to the left and to the right, using painters tape to mark them out... I would also use a stud finder to verify, or look for nail holes in the base trim to get an idea where the studs should be... its not always accurate so I use as many methods as possible to determine the location.

Once you find the studs, its time to mount the bracket at the height you want it to be at, generally i put the arms on the tv with plenty of up and down adjustment, then put the backet into the clips with the tv laying face down on something soft.

Then measure down from the top of the tv to the top of the bracket to find the distance, then determine the height you want the tv, and mark the top. Measure down from the top, the same distance the top of the bracket was from the top of the tv, and put a mark. This is where you want the top of the bracket to sit on the wall. Now its just a matter of using the lags that the bracket comes with to mount the bracket to the wall. Make sure to use a level to keep it level (makes it MUCH easier to get the tv sitting level when you start with a good bracket)

Once you do that, make sure the arms are tightened to the tv well, and give her a go, and adjust level by raising and lowering the arms on the tv.

If you want to run the wires in the wall, its actually pretty easy as well, assuming there is no fire block in the wall.

Hope this helps, sorry if I was confusing, Its tough to describe without pictures, and unfortunately I don't know the basic rules for building construction in the UK.
Edited by identitycrisis - 10/29/12 at 9:23am