No chance of legal aid, as far as I know. The rules have changed considerably in the last few years - of course making it tougher to get it.
It is available for very serious criminal motoring offences such as causing death by dangerous driving, but not for a straightforward drink drive offence.
However, I am not absolutely sure.
Penalty for drink drive - ban of between 1 and 3 years; a fine up to �5000 or possibly a 6 month prison sentence.
If you are saying his breath test was 72, the guidelines are a 2 year ban - more if he has a record of previous convictions / offences.