jgharston wrote:
Thanks for the advice from everybody, I'm currently waiting
for Digital Help Scheme to get back to me to arrange
an aerial installation.

They got back to me and said he doesn't qualify for an aerial:
"only when signal is not reliable on terrestrial TV channels
(BBC1 – Channel 5) will an engineer consider replacing an aerial"

His social worker has spoken to them saying that yes, the analogue
channels are ok, but all the channels the digital box can find...

Oh, it can find the channels, you don't qualify for an aerial.

No, yes, it can find the channels, but they're all breaking
up into little squares the sound is a continuous suttering.

No, you don't qualify for an aerial.

So, will have to go back to them in September when terrestial
TV channels will be nonexistant and see if the digital signal
is any better.

JGH