Hello everyone, Jules here.
I actually, eventually, found a cure for blocking out noise from the house when I am trying to work from home.
I now were a pair of the squidgy ear plugs (look like blue tac) called 'worlds Finest Natural Ear Plugs (earplugsonline.com) and a pair of over the head ear defenders called 'Delta Plus' (bright aluminous yellow/green). The ear defenders are comfortable and fit very snug against the ear.
The 2 together don't block out everything - but its the nearest I have come. I have a real problem focusing with noise.
Someone told me recently that its impossible for me to block all the noise anyway as apparently you not only hear through your ears, but through some little bones in your head too. So its probably the best I am going to find, unless I have a sound proof room, which I would dearly love.
Hope it helps someone else still looking.