Fixed-term Parliaments Bill

I completely understand that it is different under the Fixed-term Parliaments Bill but remember that the consequence now of the Government losing a vote of confidence is that they at the very least have to resign and at the very most have to have a general election. There is a very high price to be paid now in relation to losing a vote of confidence or no confidence. Can the noble and learned Lord identify historically any occasion where there has been a dispute over whether something is a vote of confidence?