Yes, you can do this by going to this page.
Using the link above will delete your personal data in line with GDPR and the Data Protection Act 2018. If in future you come to create a second account, it may still be linked to this original account through non-personal data.
More information about account deletion can be found on the ICO's website.
If there is something we can help with or you'd like to make a comment about our service then you can send us a message here.