McNamara say that the Revenue have approved this new Company structure and they've had senior legal counsel check its legality. As for tax, you still pay PAYE tax under the scheme so I don't know what the concern is - though I would be interested to know more!
Very simple... when an interpretation from the IR relating to a particular issued is required.... either a private, or public letter ruling on the matter is issued.
Very simple... as a client of McNamara, you have a right to have a copy of the ruling for your files... it's your right as the client to have proof of such assertion to protect your interests to the utmost. If there is no letter in existence, or a McNamara's tax attorney won't provide you with documentation supporting their opinion, then stay away from them.
After all... after the audit... who'se going to be responsible for delinquent taxes and penalties, along with interest???? hmmm?