Your boyfriend will be sentenced to a ban (length depends on the reading) if he pleads guilty or is convicted of the offence in question. If the reading is very high your boyfriend may be at risk of a prison sentence.
I think that your boyfriend needs to receive legal advice. Should your boyfriend require a Solicitor it is important to instruct one as early as possible. Drink Driving law is a highly specialised area of law. As such, he is best to seek the services of an expert motoring lawyer in order to maximise his prospects of success. A conviction would also be a criminal one and he would need to check with an immigration lawyer to see if it would affect his application for residency here.
Whilst he may be able to use a duty solicitor at Court, their services are not guaranteed. Furthermore, if he is lucky enough to speak to one he may only get 5 - 10 minutes at most and will have no control over the skill or expertise of the duty solicitor at Court that day.
The police frequently make errors in the procedure, either at the road side or at the police station. We have dealt with situations like this before with success and are able to offer advice on whether the procedure was followed correctly with a view to persuading the Court to rule that the sample is inadmissible.
We offer 2 levels of service to people who are considering challenging the case against them:
(1) A written opinion on prospects of success and the defences that can and should be run in your boyfriend's case. This is often used by people who would like to represent themselves or who would like the benefit of our expertise and intend to use a less experienced and cheaper solicitor.
(2) Full representation to trial. If successful your boyfriend would be entitled to reimbursement of your legal fees paid subject to taxation.
If he wanted to proceed further then we would invite him to contact us in order to discuss matters further.