In reply to gribble:
I'm a qualified Accountant and run my own practice (when I'm not climbing, running or biking).
HMRC are mandating from April 2018 that all records will have to be kept 'digitally', and figures submitted quarterly from then on. Search 'Making Tax Digital', it's going to hit like a shitstorm in the next few months!
They are still working through the detail but at this stage they have said excel is not classed as a 'digital' record. Give yourself a head start by using a cloud bookkeeping package such as Quickbooks Online (my preferred choice), Sage One or Xero.
Or better still get yourself an Accountant who can wok together with you and get your set up on his/her preffered package.
My clients use cloud bookkeeping to issue sales invoices and that's about it, so they can get on with running their business. They aren't interested in adding columns of numbers up or working out where to journal drawings each month.
I do all the engine work behind the scenes but it means they can see how their business is performing at a swipe of their iPad/phone or laptop.
If you want an idea of price when searching locally (I recommend having someone you can meet quarterly for a coffee) for a one man sole trader I would charge circa £40 per month to include Quickbooks Online Plus, anytime support with ongoing advice, all bank reconciliation and expenses input into QBO and end of year tax return prepared and submitted.
Good luck in starting your business, hope that helps.