Which animated series or character is voiced by Ant McPartlin?

Jollop according to http://news.bbc.co.uk/1/hi/england/2225159.stm
Tyneside TV duo Ant and Dec are taking on The Tweenies in a new children's show.
The former Byker Grove actors are the voices behind Engie Benjy which will go head-to-head with the BBC favourites from early September.
It follows the adventures of an 'engine doctor' who fixes his friends' fantastical vehicles, from a sleepwalking bus to a hiccuping aeroplane.
Dec plays blue-haired Engie Benjy while Ant provides the voice for his pet dog Jollop

The animated series,'Why Don't You Just Switch Off Your Television Set and Go Off and Do Something Less Boring Instead'
https://en.wikipedia.org/wiki/Why_Don%27t_You%3F

NB the show was not animated but presented by groups of children. (satguru)

I remember seeing that and it was not animated and Ant McPartlin appeared in person rather than just his voice and the web site that Kainantu mentioned appears to agree.