Anything you do say may be given in evidence. It is not right that I should have to give a complete case for my self until charges have been made and properly explained and until there are other people around to check that questions put to me are fair and legal. The CPS do not make any sort of a deal about responses unless they are on tape. I would simply advise people to make no reply to any caution until it is in the interview room with a solicitor present. This would apply doubly is special warnings are used in interview.
People are very frightened to ask for the tape to be stopped before consulting the solicitor.
At the end of the day, he is your only friend in the station, so use him to the full, and tell him everything. If he is any good, he will advise you when to co-operate and when to keep schtum. If this is then questioned in court, the solicitor can take the blame for offering dodgy advice, and no adverse views will be drawn from the no comment response. I don't know about other forces, but in mine we keep the tape running throughout the completion of antecedents and signing of forms to protect officers against allegations. It tends to negate a whole lot of trouble.