Signature for Business account only

I have personal and business email accounts setup in Live Mail. I have created a signature for my business mail account and also set in the advanced options to only use this on the business account. 

However, the signature is also appearing in all of my personal email messages. I have set the 'Add signature to all outgoing messages' because I want the signature added automatically to my outgoing messages, but I only want this to happen with my business account.

Can this be done?

Any help much appreciated,

regards,

Andy