Lynn
If you've had this guy on your books for less than 2 years, you can sack him with no comeback regarding unfair dismissal. Just make sure there's nothing that would allow him to raise a discrimination claim i.e. disability, religious beliefs etc.
If he's an apprentice, with an approved apprenticeship agreement detailing the following:
a. It must specify that the apprentice must undertake to work for the employer under the agreement;
b. The agreement must be either a written statement of terms and conditions in accordance with section 1 of the Employment Rights Act 1996 or a written contract of employment or letter of engagement meeting the requirements of section 1 of the Employment Rights Act 1996;
c. It must state that it is governed by the law of England and Wales; and
d. It must state that is entered into in connection with a qualifying apprenticeship framework.
then you should have no problems getting rid of him Lynn. Unfortunately back in July my employers were in a situation where all of this wasn't the case and our employment lawyers told us quite categorically it was high risk if we sacked our apprentice. We sacked him anyway, it was a risk worth taking because the guy was taking the absolute pee.
Just hold a meeting, keep it short and sweet and pay him till the end of the week. I'm guessing he'll probably be relieved.