Hello fiona
Providing the info you submitted to the accountants was in reasonable shape then i would expect that your accountant may/probably will be able to resolve this with the tax office without any severe adverse consequences, although this will probably depend on their working papers / the nature of your business and the quality of your records you supplied to them and the quality of records for other periods that are available.
All i would say is that you should ensure that your currrent year/future records are "more than sufficient" to keep the taxman happy - so the taxman will not get the impression that you are trying to pull a fast one and he is less likely to want to go back to this earlier year by looking at your later records.
It is probably worth ringing your current accountant to ask if there is any info you should be keeping that you may not be.
E.g. Cash account for business
Itemised list of all withdrawls from business.
This is certainly not something that i think you need to lose sleep over IMHO and the taxman understands that records do go missing sometimes - its the case that they have been perfect in this regard themselves.
