A finished visit is
already half an invoice.
Six of the twenty-four. From a visit you have ticked off to money in your bank, and then the paperwork the taxman asks for afterwards — which is the half nobody enjoys and everybody leaves until it is expensive.

All 6, in detail.
Invoices
Completed visits become draft invoices on their own. Send them, chase them, mark them paid.
The single most expensive habit in this trade is finishing work and not billing it. A completed visit becomes a draft invoice on its own, priced and dated, so the question is whether to send it rather than whether you remembered.
Card payments
Clients pay by card on a page in your own colours and logo. Stripe handles the card, you get the money.
People pay faster when paying is easy. A page in your colours, your logo, and your own Stripe account behind it - the card is Stripe's problem and the money is yours, landing in your bank rather than sitting with a middleman.
Expenses
Receipts, bank statement imports, and ten categories your accountant already recognises.
The work is not the receipt, it is the sorting - and the sorting is what nobody does until the year end, by which point half of them have faded to blank paper in a glovebox.
Mileage
Logged from the round automatically at the HMRC rate, with the claim worked out for you.
On a dense round this is usually the single largest thing people forget to claim. The alternative is reconstructing a year of driving in April from a diary and a hope.
The tax year
Corporation tax, the P&L, the VAT threshold and the CT600 boxes, without a spreadsheet.
Not a replacement for your accountant. It is the difference between handing them a pack and handing them a carrier bag, and between a bill for their time and a bigger one.
Monthly summaries
Every month totalled up: what came in, what went out, and what is actually left.
Most small trades find out how the year went once the year is over. This is the version you can still do something about while there are months left to do it in.
Easier to judge with a week of work in it.
Ask for a demo login and have a look at the lot. When you want the real thing, the first month is free and there is no card to put in until it ends.