French doors connect the dining / living room which I'm going to revert BACK to a solid wall (the rest of the wall is 3" x 9" commons) but I'm unsure whether to go for reclaims, medium density blocks or aerated (wickes) blocks. If the latter do they require special "tile type" adhesive or just normal bricklaying mortar. Also should I "key in" to the existing brickwork or will a "wall starter" top to bottom both sides be sufficient to prevent any movement / cracking?