Using your personal account can be a PITA if you ever get investigated as they will want to know what every little transaction is.
I personally have a business account, I pay charges on cash paid in over £1000 only. I have a monthly bank fee, all charges go against your tax bill so why worry?
I keep mine separate and just pay my wages over weekly by direct debit, keeps things simple especially when doing book work.
My plumber just has one account with his and his wife's name and they both have access to it, they pay for shopping etc out of one account, no idea how long it takes to reconcile everything.
Business account for business and personal for myself, and I intend to keep it that way.