About 1910 based on clothing style and photographer.
Miss J. D. Boswell
430 Brixton Road
Brixton
London, S.W.
Flood & Son, Ltd.
The Grove, Lowestoft
Will have a paddle. JWD
Caption: Lowestoft, The South Beach
This is an embossed card, so it cost a bit more. Note that the sender is still using the front of the card to write his message. Maybe this is an older person, who is used to old style cards where you weren't allowed to write on the address side? There is no sign of a stamp or postmark, so this card was never posted.