Pizza chain Papa Johns has said it will close nearly a tenth of its UK restaurants - all of which it says are "underperforming". The closures follow a review of the business which identified sites that were "no longer financially viable". The chain, which has 450 restaurants plus others in service stations and holiday parks, will close 43 sites but has not said how many jobs will be hit. Separately, Revolution Bars has said it could sell "all or part of the group". Its announcement followed reports that said Revolution could shut about 20 bars, or a roughly a quarter of its outlets. While other sectors of the hospitality industry have faced serious problems in recent years, takeaway outlets in general are booming, according to consultancy PwC. Papa Johns had previously said it planned "strategic closures" in order to free up money for investment and improving profitability at its remaining UK sites. It plans to expand further into non-traditional sites like holiday parks and the chain said it would "announce other large retail partners in the coming months". So far this year, the Body Shop and night club chain Pryzm have already run into difficulties, announcing the closure of sites.