South of Nuneaton, at the A444/B4113 roundabout is the national distribution centre of Dairy Crest, where it also packages Cathedral City cheese. North of Coventry, Oleo International (its name is from the Oleo strut) is a world leader in railway buffers based on the B4113 in Exhall, next to the M6. The London congestion charge is operated by Capita, based at Prologis Park (Bedworth) in the west of Exhall. Rolls-Royce have a large engine overhaul plant (former Armstrong Siddeley), near Ansty and the M6/M69 junction in Coombe Fields, which also makes their engine casings, built on a former airfield; Ansty Park is a new development on the same former airfield.