Yes. First of all, go to https://www.helpspace.org.uk/login and log in to your account. 

Once logged in, you should see a menu item 'My Profile' in the main menu. 

To change the email address associated with your Helpspace account, simply enter the new email address in the email field. Then click the Save button at the bottom of the page.

Be aware that the confirmation emails for any sessions booked before this point will have been sent to your previous email address.