Do you mean the interest on the loan itself or interest charged by the Director to the Ltd Co? The latter is definitely tax deductible to the Company but the Director should include interest received on his tax return.
As far as I can ascertain, and like you said, there's not much out there on it, is that the interest on the loan itsel is tax deductible for the Director. eg interest charged to Ltd Co £3000 income less £3000 interest on loan net result no tax due, subject to certain criteria. See Euans reply on this thread http://www.accountingweb.co.uk/any-answers/directors-personal-loan-for-companys-use
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John
Any advice given is for general guidance and professional advice should be sought applicable to your circumstances.
The link you have provided is the only one I found on google. As the interest isn't actually being paid would I still need to submit the CT61? Unless I submit the CT61 and put the interest to the DLA?