UK Immigration Law
Have UK Immigration Law Questions? Get Answers Now.
I would agree in that the risk of not mentioning it and if the UKBA has this information they would wonder why you are trying to hide it and what else you were trying to hide.
On the other hand they may not have this information - but my view is that you should not take the risk.
You should instruct a firm to deal with the application on your behalf so they can put together the best possible visa application for you and deal with the conviction.
I am sorry that this is not necessarily the answer you wanted but based on what you have said, this is the legal position.