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It's the spectacle that's set to draw millions of us to our TVs this Saturday lunchtime.

But not, it seems, Jeremy Corbyn .

The Labour leader - a republican - is due at his party's economic conference at the same time as Prince Harry and Meghan Markle tie the knot.

During Prime Minister's Questions today, Mr Corbyn wished the couple "all the best" and thanked Prince Harry for his work on mental health.

Following the session, a senior Labour spokesman was asked if Mr Corbyn would be watching the royal wedding on television.

The spokesman replied: "There's catch-up, isn't there?"

He said the Labour leader was due to speak at an economics conference at the time of the wedding on Saturday, so would not be able to watch it live.

(Image: AFP) (Image: PA)

"He wishes them all the best and he is a particular admirer of the work Prince Harry and Prince William have done in relation to mental health issues," said the spokesman.

Mr Corbyn did however meet the Prince of Wales on Wednesday, sources confirmed.

They would not go into detail about the circumstances of their meeting.

At PMQs , Prime Minister Theresa May offered her best wishes to the couple.

(Image: REUTERS)

She said: "I'm sure the whole House will wish to join me in offering our best wishes to His Royal Highness Prince Harry and Meghan Markle on their wedding this Saturday and the very best for their future lives together."

In light of Mental Health Awareness Week, Mrs May praised Harry's "tireless work" in raising awareness about the challenges faced by service personnel as they move into civilian life.

Mr Corbyn joined Mrs May in sending his wishes to the couple and thanked Harry "for the work he's done in highlighting the need to challenge the stigma surrounding mental health, and the ability of all of us to talk about mental health to ensure people don't suffer in silence on their own - particularly young people who are so often grievously affected by this".

Harry and Meghan are tying the knot from noon in St George's Chapel at Windsor Castle.