Irrespective of whether or not any SDLT is payable, if the transaction is notifiable then an SDLT return needs to be filed. A failure to do so, or a delay, may result in a penalty.
Masca wrote:I feel that I have to at least try to appeal the penalty charge
To be successful, you would need to have a reasonable excuse. Your excuse appears to be ignorance of the law, this is not a reasonable excuse.
Masca wrote:I believe that penalties can be no more than 100% of the tax due
Your belief is wrong.
Masca wrote:I feel is unfair given the circumstances
If you feel the law is unfair then I suggest that you lobby parliament to change the law. However, it is unlikely that any such change would be retrospective. Consider contacting your MP to raise the issue in parliament, start a petition or perhaps a peaceful protest.