Image source, Getty Images

One man who knows these streets better than most is David Weir.

Today he will compete in the London Marathon for the 25th year in a row, bidding for a ninth victory.

He will do so with a new racing chair that, on paper at least, seems to have significantly boosted his chances.

Armed with the new equipment, 45-year-old Weir has been resurgent this year - setting personal bests in other distances and breaking the T54 5000m British record in February.

Competing in the same chair as long-time rival Marcel Hug in a marathon for the first time, Weir finished in third place and six minutes behind the 'Swiss Silver Bullet' as he won his seventh Boston Marathon on Monday.

What can Weir do with home advantage today?

Jackie Scully, breast cancer survivor, who is running in the London Marathon told BBC: "I got married seven years ago and ran the next day in our wedding gear. This year marks my 10 years clear of breast cancer. I decided to turn it into a team game this year and show that cancer affects not just one, but others around you. We have the most amazing bus to run in so hopefully the crowds will get behind us and we make our way round."

Image source, PA Media

Later on thousands and thousands of people will take to the streets of London, each taking part in the marathon for their own special reasons.

Jackie Scully who had breast cancer will be one of those running - and she'll do so in a 10-person bus costume in a bid to break a Guinness World Record.

This year marks 10 years since Jackie finished chemotherapy.

She ran the marathon in her wedding dress after marrying her husband, Duncan, a few hours before but this time will be joined in her bus by nine friends.

The time for them to beat for the record is six hours and 55 minutes.

"I hope we can do it and I think crossing the finish line will be among the most amazing moments of my entire life," she said.

Here are the key timings this morning:

• 09:05 - wheelchair races
• 09:25 - elite women
• 10:00 - elite men and masses

Whisper it but it's currently dry and sunny in London.

The crowds are starting to build at Greenwich Park.

This is the route they'll take...

As ever you can get in touch with us throughout the day today.

Whether you want to send a good luck message, give your take on the elite races or just have a chat please do send us a message.

You can do so on X at #bbcmarathon, by texting 81111 or send us a WhatsApp on 03301231826 where you can include your photos too.

Please do include your name on messages too please.

It's always one of the most special days on the British sporting calendar.

The London Marathon - the day when 50,000 people take to the streets of the capital at for their own special reasons.

We will start with the elite athletes this morning before the fun runners, those running for their gran, the ones dressed as a dinosaur or a fridge set off on their journey.

Stay with us for it all.

The London Marathon.

It's always emotional...