Quick outline so I don't bore you....
I used to run a business in partnership with my DM. Anyway things trotted along ok, we didn't make much and eventually I moved out to get full time work that actually supported my DS.
DM was then in charge of the books. She used one book keeer who did a runner, taking (or more likely simply not returning) several years of paperwork. Some returns were filed with crazy amounts of tax to be reclaimed on (though these were accepted by HMRC with no question) No money was reclaimed as I pointed out the mistake.
She then moved onto another book keeper who fleeced her, also lost paperwork and didn't file any returns (recurring theme here?)
Anyway the business is now closed, DM has retired. I however have several years returns missing, absolutely no paperwork to support anything and a home visit from HMRC tomorrow 
I have tried to speak to them, they tell me I need to fill in returns to the best of my ability but can give me no clue as to how to do this.
So what do I do? This has been running for a couple of years now and I admit that I have buried my head in the sand a bit as it is so frustrating. I have even asked to be able to pay an amount monthly towards any debt I may have but they will not allow this without returns being filed 
In all likelihood there was no tax to pay as every previous year we fell under the threshold. I cannot afford professional help and even I could, what would they do with zero figures to work on?
I really do want to get this sorted but cannot see a way forward. I am seeing this lady tomorrow morning and really could do with some ideas as to how to deal with the situation now.
Many thanks :)