Ford is unlikely to have more than one RS product on sale at any time, according to its president of marketing in Europe, Roelant de Waard.

Recent speculation had suggested that, if given the go-ahead, the next-generation Ford Focus RS could launch in 2015 and be joined in an expanded range by other RS products, potentially including a Fiesta RS.

However, Roelant de Waard said, "Our focus now is on the Mustang, but over time there is aways room for RS products. But what is clear is that RS shouldn't be a series, or a car badge that we have in our portfolio all the time. It is an extreme car – something more than ST.

"It is so evocative that I'd be highly surprised if there were not more RS products – plural – in the future, but I would be surprised if there was more than one at the same time."