Assuming it was a normal goods van rather than a car-derived van or dual-purpose vehicle, the limit on a dual carriageway was 60mph, not 70mph, so at 76mph the next step is usually either a fixed penalty of £100 and 3 points, or a court referral if they do not deal with it by fixed penalty, and because the usual course threshold in a 60 is up to 75mph you are normally just outside speed-awareness-course territory.
You do not get to choose a ban instead of points, because only the court can decide that, and for 76 in a 60 the sentencing guideline sits in the 61-80 bracket with 3 points and a Band A fine if no disqualification is imposed, so in the real world the most likely outcome is 3 points and a fine rather than a ban, unless there is something unusual about your record or the case.
