Those Kiddles dolls are not on sale in the UK and I doubt GOSH would have got royalties from the American manufacturer. Even Barrie did not receive royalties from many products and merchandise based on Peter Pan made in the early years (such as Peter Pan Peanut Butter or Peter Pan Bus Lines, as copyright was more difficult to oversee then, particularly overseas. In more recent times, because of different copyright terms worldwide, Peter Pan is in the public domain in most countries so no royalties would be due (except where trade marks have been registered, and most of these would be owned by Disney).
Royalties would have been due on books published while the copyright of the novel Peter & Wendy was still running, which I believe was until the 1980s in the US and Australia (for example). Once Peter Pan entered the public domain, no royalties would be due to GOSH, except in the UK where the Copyright Act of 1988 granted them a right to royalty in perpetuity from all commercial exploitation on stage, radio, publishing, or film (but not toys or merchandise), even though it is officially out of copyright.
Hope that helps!