Hi Bigbobo,
HMRC can get access to Land registry in England Wales etc and Register of Sasines in Scotland. Into the bargain they do also have access to the District valuer who inevitably has considerably more information as regards renting and development etc.
Be very careful here as if you provide part only of the information then of course they might think that you are concealign matters intentionally.
If you haven't already got a tax enquiry adviser then I would suggest that you engage one now before you get yourself into more trouble. I would especially recommend that avenue if you have understated your rental incomes on the one hand and also potentially any self employment or company profits used to acquire your properties. Be very careful if they ask for a mandate to approach your solicitor(s) or bank(s) as this would be an interesting places for them to be and trawl through your financial papers.
regards and hope this helps.
bill@wamstaxltd.com
http://www.wamstaxltd.comregards and hope this helps
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