Hi Adrian,
Since your site is an established and indexed for 7 years property, I would not move it since
1- The links are actually pointing at your .co.uk domain and that won't change even with proper redirection.
2- People must probably knows this URL in some proportion
3- Your domain has build a trust from search engines that I would not play with to start from a new one.
Maybe someone would think different, but I prefer building a new site with new content or new content to my site then to risk it's futur.