You have 12 months to let some go without reason. If they are with you for more than a month then they are entitled to a weeks pay in lieu of notice. All you do is tell them your not suitable. Don't expand it could end in tears.
If you have a gut instinct get rid now. I made the mistake of doing not that and now I need a solicitor at £165 hr.
Employees come and go, so don't feel guilty. I used to but when you over hear what they say about you and your business, its like water off a duck back.
Regards
CATMAN