Accountancy service like 'Crunch.co.uk' or keep track of it by yourself?

[takaran]

Hello,

I'm about to create a LTD company after 3 months with umbrella company, I was permanent on my previous job.
I have a 12 month contract now with that company and I don't plan to get anymore work during this period, as I'm busy enough. I basically want to move on to limited to save a bit on taxes, as I'm paying around 40%.

My question is, once I create the LTD company, whether is worth getting a full service like SJD or Crunch.co.uk that covers you every month, or keeping track of my expenses and salary in excel/any other software and hire an accountant once a year to sort out all the paperwork for HRMC.

I'm not very good at finance at all, but I wonder whether due to the simplicity of my circumstances (only working for one client + being permanent before) if I really need a yearly coverage or a one off accountancy service will be enough.

Many thanks in advance, any tips will be very welcome