I decided to buy a LineX FM transmitter (Pauls recommendation) rather than the much more powerful Veronica model.
I received the LineX this morning and i'm pleased to say that it's great for around the house (and more than likely the garden) with very good sound reproduction.
It uses 3 AA's and battery life is supposed to be 150 hours, no external supply.
Mine is version 2.0 going from 88.0 to 89.2 mhz, the newer models i believe start from 100 mhz and are less powerful, so i've been told.
In the end i had to buy it off ebay (Germany) total cost £22.99, other web sites in the UK said that they were now unavailable
.
Anyway i'm now
, thanks to Paul and Gordon for their advise
Julian