Tom,
no matter how much work you have, and no matter who you employ, and the amount of work you clean, the best advice i could give to you is get yourself a good accountant.
I had the same accountant for 19 years, and i suppose i didnt like change, until 2 years ago i thought i have had enough !!!!
I changed accountants, and he IS the best thing that could have happened to me.
In the time of the accountant i had for 19 years, i never once sat and had a conversation with him, but my new accountant chats with me all the time, i can go and see him and have a cuppa with him, and he advises me to almost everything, and my business has never been in a better situation.