The company, which also owns Haven Holidays and Butlins, held a competitive pitch.
According to a statement from Diffusion, it will concentrate on attracting the next generation of Warner Leisure Hotels guests by "celebrating retirement" and highlighting how Warner breaks allow guests to make the most of their leisure time.
Also part of the brief is driving bookings of Warner’s Star Breaks, which feature a line-up including The Osmonds, Billy Ocean and Elaine Paige.
Hannah Sardar is PR manager at Warner Leisure Hotels, which has 13 hotels around the UK.
She said: "We recognise that we always need to evolve our offering and ensure we keep appealing to each new generation that looks forward to how they are going to spend their free time as they reach retirement. We want to be part of that conversation at a national level."
Last autumn Bourne Leisure reported that pre-tax annual profits had risen by more than 10 per cent to £107.8m.