Folks,
the rules may be summarised as follows:
1. The solicitor must pay you the demand deposit interest rate, unless it is below a certain figure (I don't know the current figure - previous poster said €190; I assume this is right. When I qualified as a solicitor the figure was IR£50; )
2. You can't get a higher rate just because the solicitor is getting a higher rate from the bank (the solicitor will have deposits from many clients, so is able to negotiate a better deal with bank; the individual clients do not get the benefit of this, which is fair enough). You can only get the interest rate appropriate to your money.
3. If your solicitor is holding money you can of course make arrangements with your solicitor to have it placed in a separate account, which may well produce a higher interest rate (actually, it definitely will). There may be a charge from your solicitor for this, but it may be worth while. (My rule is that I do not charge for opening a separate account in the same bank that my firm uses, but I do for other banks, as there will be an admin. overhead for me). Bear in mind that it may be necessary to keep the money available on demand (depending on the nature of the transaction) which may affect the available interest rate.