Sorry but I think that you're out of luck.
Googling for that item finds no reference to it ever being sold new by anyone other than Lidl and a quick look at the website of the Intellectual Property Office shows that the brand name 'Parkside' is actually a trademark owned by Lidl. (i.e. nobody else can market that brand).
So, unless Lidl decide to offer it again as one of their weekly promotions, you won't be able to buy it new.
However it's worth remembering that Lidl don't actually make such products; it will simply be another manufacturer's product which has been badged with the Lidl brandname. So you might be able to find it sold elsewhere under a different brand name.