Lamb's Navy Rum has joined forces with the Royal National Lifeboat Institution (RNLI) for the first time in an on-pack promotion that offers a two-week cruise holiday.

Nearly 100,000 bottles of the Halewood rum are being rolled into the off-trade with competition information on a neck collar.

For each of the first 25,000 competition entries received, Lamb's Navy Rum will donate £1 to the RNLI.

The charity link was a "perfect fit", said Sue Beck, senior brand manager.

"The promotion will increase awareness of Lamb's seafaring heritage and ­attract new consumers."