I wanted to contact Homebase to change the address on my Spend and Save card - not the Store Card version.  I used two numbers off of the Unverified numbers list and this is what I got:

The first number I tried was listed as:
Homebase Spend and Save - 077 8888 - 01785 710210 - You may need to be redirected but it's the right place
I can confirm that it is the right place, but the operator I got wouldn't transfer me.  She said I had to ring the 0845 number, although was very sympathetic and suggested that making money off of calls was a way to help stores make more money!

The second number worked and was listed as:
Homebase - 0845 0778888 - 01908 690333 - Switchboard Number. Ask for Homebase Customer Services.
To clarify that: The switchboard number was for Argos Customer Services who transferred me to Homebase Customer Services, where I got a nice man in Homebase bathrooms who transferred me to Spend and Save! Result!

Thanks to all that keep the database going!

Thanks a lot.