Sole Trader Question

I am part time employed and I set up a very small business as a sole trader in 2012 selling online. I did a tax return for 2012 & 2013 for this. This is no longer trading.

I recently started another small business (registered another business name) myself on the side and I'm wondering do I need to fill in another Tr1 form or is the fact that I am already registered for tax enough?

If you are already registered for income tax and have not de-registered there is no need to register a second time for the new business

Thank you for the reply srase, I really appreciate it.