According to the description in cPanel:
So if you check using webmail with your cPanel account you should see a folder called "spam". Or you can just empty it in cPanel itself.
I don't use the spam box, I just have the spam automatically deleted.
If it's in your public_html folder wouldn't you just access it as your-TCH-domain.co.uk?
If it's in a sub-folder just rename the sub-folder from wordpress to blog and change the setting in the administration panel. You may also need to make a change internally to the database.