Pingdom page speed not working for London location

Hi, we have tried to test the website speed for the following website from London location.

However everytime we try it, after a few seconds, it throws error saying some problem has occured.

Initially we thought it's temporary however it happens every time.

Can you please confirm if there is an issue?

Same thing happens when I tried Germany location.

Please see the screenshot of the error for reference. 

Can anyone please provid e a fix?