Liam,
Can you ask if there's any significance in his bail being cancelled?
For example, could he be facing a lesser charge, where he doesn't have to attend court in person?
Was it confirmed that his bail was cancelled? I wasn't aware of that.
I guess a prison sentence is unlikely although I wouldn't rule anything out. In any event, he would be foolish not to attend court as he has been charged.
I would expect him to receive a fine and be disqualified from driving - as he is due to appear in a magistrates court then his fine will be anything up to £5,000 which is the maximum fine permitted in the magistrates court. Fines are usually taken into account on a persons income and their ability to pay.
His ban from driving or any potential prison sentence would depend on the amount of alcohol he had consumed on the night of his offence. There are guidelines available but I'm not sure what they are off the top of my head as I don't work in a Criminal based section. He will however get a reduction off the ban providing he takes part in a driving awareness course or whatever they're called nowadays.
He would be pointless getting legal representation as he will not, regardless of his mitigation put forward, escape a driving ban but they will argue for a lesser fine and reduction in the ban.