Sarah,
The penalty for driving without a licence is 3-6 points and fine upto £1,000. If your husband has also been charged with driving without insurance, then he will receive 6-8 points on his licence along with a fine of upto £5,000. Under the New Drivers Act, your licence will be automatically revoked if you accumulate 6 or more penalty points on your licence within 2 years of passing the test. Penalty points will stay on your licence for a period of 4 years from the date of the offence and if your husband is charged with both offences, then chances are that his driving licence will be revoked and he will have to sit the driving test again.
For new drivers, only 6 points are required to get disqualified from driving within the first 2 years of passing the test. For other drivers, they should not accumulate more than 12 points within a 3 year period, otherwise they would be banned under the totting up procedure.
If he is charged with driving with no insurance, then the penalty points would be enough to get his licence revoked but if he is only convicted of driving with no licence, then he may stand a chance if he gets less than 6 points.