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The clue, you might just think, would be in the name.

But fans of the hit ITV game show The Chase were left in despair as a team of Brits failed to name the national language of Wales.

During last night’s episode, host Bradley Walsh saw one contestant stumped by the seemingly simple question “What’s the Celtic language of Wales?”

Blank faces and panicked discussion followed, with each of the other contenders also unable to answer the question.

But the biggest shock was the response given by Shaun Wallace, The Chaser himself.

Supposedly the guru of all knowledge, who all teams have to challenge in a head-to-head of smarts, gave an even more mortifying answer.

After several agonising seconds, Wallace sheepishly remarked “Errr...Manx,” before Twitter exploded with reactions of disbelief. And so no doubt finding himself a coveted place in Private Eye's regular column Dumb Britain.

And if after reading this you are still flummoxed by the question, the Celtic language of Wales is... Welsh.