Re: Who to contact
It all depends on what type of advice they require. If it is specifically taxation advice or asset 'rejigging' then the accountant may be the route to go.
If it is for letting agent, tenant locator, management of the rented house, then the accountant is probably as useful as a bikini bottom on a man.
It is also important that they have valid Wills made up and again, from experience the acountant would be the worst way to go. That should be the sole function of a competant solicitor.
You should be more specific as to the advice that is required.