Quick Weight loss

[Guv10]

I've been stupid and piled a load of weight on that I lost last year. I'm currently 17st 10lbs. I got down to 14st 10lbs last year. I've got a wedding to go to in August and I really want to be as close to that weight as I can.

I obviously realise I've left it very late. Is it even achievable?

Going to clean my diet right up and hit the gym.

Any pointers to lose quick?

Thanks