In article , p cooper
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John Lewis ( from whom we bought it - who also said the
instruction manual was good!!) say its the aerial.

Certain to be.

1) is this true - do modern TVs need more signal strength
that old ones.?

No, they are just as good if not better. Your problem is one of these:

The old TV was so poor that you didn't notice the problem.

The aerial has suffered damage just before the TV installation

The plug on the aerial cable has been pulled partly off the cable during the
installation.

Your aerial cable is kinked or crushed

The TV has been set up using the horrible auto setup feature. You have no
control over this and it may pick up another (unwanted) transmitter output.


2) if we improve reception for Ch3 are we going to
loose it for the others ?

Improving CH3 will not affect the tightness of anything else. If you sort
out the aerial system, all channels should be equally well received. If you
LOSE other channels, then there is *still* an aerial problem.

--
AJL Electronics (G6FGO) Ltd : Satellite and TV aerial systems
http://www.classicmicrocars.co.uk : http://www.ajlelectronics.co.uk