Former Olympic sprinter Roger Black has told ITV News that the UK is "witnessing the greatest British athlete we have ever seen", after Mo Farah won his second gold medal at the World Championships today.
Mo Farah's wife Tania says she is "overwhelmed" after he won a historic second gold in the 5,000m at the Moscow World Athletics Championships.
She said watching the race was more nerve-wracking than watching the Olympics, because of the level of expectation. She spoke to reporter Rags Martel.
Manchester United footballer Michael Carrick and former Olympic hurdler Colin Jackson have called Olympic champion Mo Farah's win at the 5,000 metre finals in the World Championships a "class performance".
Another class performance by @mo_farah.... Awesome ?????
British athlete Jessica Ennis-Hill and sports commentator Clare Balding are among the sporting community who have taken to Twitter to congratulate Mo Farah, after he won the 5,000 metre finals at the World Championships.
Never in doubt! Another amazing performance! Go @mo_farah
Unbelievable! Mo Farah is just immense.
Olympic champion Mo Farah has become a double world champion after winning the 5,000 metre finals in Moscow today. Farah is only the second man to hold the 5,000 and 10,000 Olympic and World Championship titles.
Double Olympic champion Mo Farah has said he "is set" for the 5,000 metre race at the World Championships this evening.
All set for tonight...!! Yeeeeezzzzzzzz!!! http://t.co/1dceuovH9d
ITV News London has spoken to Mo Farah's wife Tania on the phone from Moscow, ahead of this afternoon's 5,000m final.
She said Mo sounded "like his normal self" ahead of the race, which could see him winning a historic 'double double' - two medals in two events, as he did at the Olympics.
Mo Farah will go for the 'double double' at the athletics World Championships in Moscow today when he runs in the final of the 5,000 metres.
The British runner is aiming to add the title to the 10,000 metre gold he won in Russia earlier this week.
Farah won 5,000m and 10,000m gold at the London 2012 Olympics.