Sorry, silence was because of working away.....
All the police have to do is to show that you were in charge of the vehicle on a road or public place, and that you were unfit to drive or that you were over the prescribed limit. That seems to all be present in your case.
YOU can then plead not guilty on the basis that you were not likely to drive the vehicle whilst still over the limit. You could not just say "there is no way I would have driven while over the limit." You have to produce one evidence of your likely movements over the next few hours and expect to be questioned in court about your work times etc.
You would also have to get a 'technical defence' form filled in by an expert who would need to know your height weight etc and how much you say you drank, and when. From that he would produce an estimate as to how long it would take for you to become under the legal limit. This costs in the region of £300 and it is served on the prosecution who can either: accept it, and discontinue the case or dispute it no get their own technical defence expert to counter what has been said in your report. Now it can get messy..... if they both have to go to court to give evidence and you lose, the £800 fee each would be claimed against you. If you win, you might still have to pay a large part of your defence costs, Drink driving or in charge offences are not normally covered by legal aid.
the other option is to plead guilty to 'in charge' but put forward mitigation about the circumstances and how you felt that you wouldn't have driven whilst over the limit.... evidence of good character and (if relevant) a letter from your employer saying how you would lose your job if disqualified. The magistrates are entitled to NOT disqualify you for an 'in charge' offence, it is discretionary. BUT if they decide to not ban you, you will get 10 points instead. If you already have 3 points or more on your licence, you still might get banned for 'totting up' for reaching 12 points.
You may be able to get advice on this at court from the Duty Solicitor if you get there early. This is dependent on how busy the court is as they tent to focus on the more serious offences if there are some tomorrow. The advice will only be brief, but it is free. I just want you to be aware of the financial implications of going not guilty as this sometimes can get lost in the 'enthusiastic optimism' that some solicitors give out. (Not Sean on here, he is a specialist and up front about all their costs)
thank you for your help and advice.Ill let you know how i get on.. thank you..