Nestlé is overhauling its Kit Kat Senses bar by introducing a new caramel filling to replace the existing hazelnut flavour.

The confectioner claimed the popularity of caramel flavours among women would open Kit Kat Senses Caramel Cream to a wider female fan base, and accelerate the £33m sales that the brand has achieved since launching in 2008.

Rolling out on 27 September, the bar will feature a layer of dry caramel filling and will contain 165 calories per bar the same as the existing recipe.

Packaging on selected Kit Kat Senses bars will ­carry a pink ribbon flash to mark Breast Cancer Awareness month and Nestlé has guaranteed a minimum donation of £100,000 to the ­campaign.

A £2m outdoor advertising campaign will raise awareness of the flavour change and run throughout the autumn.