Hey @Glenn
Thanks for your prompt reply as aways.
Pre April 15, I was using KashFlow... I no longer have access to that system, but have all of the receipts and invoices etc stored electronically, plus I took a trial balance as at 31 Mar 15 when switching (which I modified to deal with outstanding payments etc).
To be honest though, I'm concerned about categorisation and classification - I'm not convinced pre-and post-April expenses are ending up in the same accounts and I really do worry that things aren't going in the right places for tax allowances / disregards etc. That's really the crux of my concerns... I just don't know whats what with tax law 
I presume that the accountant would look over and make sure it's all right?
Cheers,
Will