I am due to sell part of my client fee base (sale of fees plus business name/branding included), I have had a mental block on the correct bookkeeping treatment for this as I am not selling shares or the whole of my business!?!
They are purchasing 100% goodwill, but what are my transactions?
You are selling your goodwill of your business, so its your CAPITAL GAIN. You would show it in the same way you would show a capital gain in your records.