Radio 1's Greg James wants to hear from YOU on his Red Nose Day challenge

BBC Radio 1 Breakfast presenter Greg James is taking on a massive challenge for Red Nose Day.

Greg is swapping his morning tunes and celeb chats with a gruelling challenge that will take him right across the UK.

He's cycling 1000km on a tandem bike from Weymouth, in Dorset.

The journey will see him leave the south of England and cross through Wales before ending up in Edinburgh on Red Nose Day on 20 March.

Newsround will be meeting Greg on his journey and he wants to hear from YOU.

You can send him a question to keep him busy on his journey. It might be about why he's doing this challenge, what's the most difficult part, and how much he misses his own bed!

Whatever it is, leave a comment below and we will try and ask as many as we can...

This isn't the first time he's taken on a challenge for Comic Relief, who are the charity behind Red Nose Day.

In 2016, the DJ completed five triathlons in five days in five different cities across the UK - in a challenge called the 'Gregathlon'.

In 2018 he cycled over 800km and climbed mountains Scafell Pike, Snowdon and Ben Nevis - and famously said he'd never do a challenge like this again.

When asked why he agreed to do it again, Greg said: "Well, here I am again - I honestly thought I would never be so silly to say yes to Comic Relief again, but why not make it a hat-trick?!"

Greg won't be doing it alone, though, he will be joined by some familiar Radio 1 faces, as he spends at least eight hours a day on the bike.