This Marconiphone advert from February 1951 was quite an early advert for a "Summer" product, their latest portable radio. As it is not mentioned, I assume batteries were not included in the dual mains/battery set.

So easy to sell...
So readily accepted...
So certain to satisfy...

Marconiphone models are priced to suit the current market, yet Marconiphone quality remains undiminished.

So always recommend... 

Model T24 DAB 4-valve, 2 waveband DC/AC Mains/Battery portable receiver £18. 2. 6. (tax included)

Marconiphone: The Greatest Name in Radio

Ref: M.248.
The Marconiphone Co. Ltd., Hayes, Middlesex.