I'm not sure you'd use this as a proper lamp, but it is great to explain a bit of science to kids.
It's got a RRP of £20 and was at the regular price before Christmas at £12.99
Now at £6.49 seems a fair deal. It's the 25cm/8 inch one like this: https://www.amazon.co.uk/Global-Gizmos-8-inch-Magic-Plasma/dp/B009RQLI36/
I've never used B&M online, so assume it's just in store. I saw it in Belper.