Personally I prefer the 'human' accountant. I've been using an experienced accountant for many years, and continued on when I created the LTD. He also does my personal taxes, the PAYE etc. For the company, we 'share' a google spreadsheet that is very simple, I add my invoicing, expenses, and he uses that to do the VAT bits and PAYE. Very low overhead, and he's very cheap too -- he's also 1 mile away, so I go and sit down with him and chat about options etc if I feel like it.

There might be some pretty good small accountancy firms around that will cost a LOT less than these fancy online firms, so do check around locally, or asks for recommendations -- I think it's worth it.