Fixing a 50inch tv to a wall.

I've got a 50 inch tv with a wall bracket. So I drill a hole in the wall and i've got 15mm of skimmed plasterboard, about the same air gap, then a really soft blockwork inner wall.

The wall bracket came with fixing that are too small to reach the blockwork, so I'm going to need some ironmongery to fix the thing to the wall.

Any ideas? I thought maybe these...

http://www.screwfix.com/p/fischer-l...6_qa6QEBhjwLJzQW2Qd7g0CgeZHew8w1TRoCdM3w_wcB#

If you have thermalite the bolts will not hold, you will need these.
http://www.toolstation.com/shop/p41...825543&gclid=CjwKEAiAv7ajBRCIldS7rp7wzFkSJAAA

Ideally mark out wall plate position and cut out that section of plasterboard [cut it 10mmm inside to avoid it showing when finished], replace with ply or mdf to same thickness leaving no void , fix it to block work then you can use coach screws to fix the bracket to the board.

foxhole said:

If you have thermalite the bolts will not hold, you will need these.
http://www.toolstation.com/shop/p41...825543&gclid=CjwKEAiAv7ajBRCIldS7rp7wzFkSJAAA

Ideally mark out wall plate position and cut out that section of plasterboard [cut it 10mmm inside to avoid it showing when finished], replace with ply or mdf to same thickness leaving no void , fix it to block work then you can use coach screws to fix the bracket to the board.

Click to expand...

Did this over the weekend. If there's an earthquake, the wall may fall down but the tv will still be attached to it. Thanks again chap.