P&O Cruises is offering free balcony cabin upgrades for new bookings made on a selection of 22 spring and summer sailings. The offer is available for four days from March 30 and can be booked until midnight on April 2, 2012.

All cruises in the promotion depart from Southampton and are between seven to 20 nights in duration. Destinations include the Western, Central and Eastern Mediterranean, Baltic, Fjords, Spain and France, and cruises are on Adonia, Aurora, Azura, Oceana and Ventura.

In the promotion, balcony cabins are available from £709 per person (the normal price for an inside cabin) for a seven night cruise on board Azura to La Coruna, Bilbao, La Rochelle and St. Peter Port (A213), departing June 9, 2012.

Savings are available of up to £1,267 per person for a 14 night Norway, Greenland and Iceland cruise on Aurora (R207) departing June 19, 2012.