If you were flashed three times, and assuming that you haven't done a speed awareness course in the last three years, you would be looking at the following.
If it's a variable speed limit camera, you may (depending on the force) be offered a Motorway Awarness Course instead of points for one of the offences.
If another of the offences were a regular overhead gantry, you would also qualify for a regular Speed Awarness Course instead of points. This offer is separate to, and not affected by, your attendance at a Motorway Awarness Course.
Any subsequent offences would incur three points and £100 fine.
So you may be lucky and "only" looking at three points, two courses, and around £300 in fines and costs.
If no Motorway Course is offered, then it will be six points, a Speed Awarness Course and around £300 in fines and costs. Obviously there will be a significant increase in your insurance premium for the next few years. If you drive for work then there may be issues with that employment as most organisations have a "clean licence" policy.