Yeah of course @HappyRambler
I started out (first time) at 15st 2 then got down to 12st 7lb in about three months doing OMAD, then following a normal gym and exercise routine I lost another 1st 7lbs but over a long period, then OMAD again got me down to 10st - which suits me!
I initially ate what I wanted for that one meal a day, between 1200 and 1500 calories, because I walk an awful lot and go the the gym/yoga, but then I was conscious that I was not eating the right sort of food and not incorporating enough good nutrients, mostly junk food (burgers, pizza, eating out at nandos/harvester etc), but because before the diet I was doing this AND having breakfast/dinner as well, it really worked.
The second OMAD was more successful in terms of 'healthiness' but I just found it tricker as I was just bored of eating on my own, bored of the kids finding it odd, and I found I had to cut calories down to about 1000 in order to see results.
As a fat loss method though, and for giving me a boost initially it is brilliant! I didn't drink any coffee as that made me hungrier, but I did have the occasional sugar-free energy drink if I was really droopy. Also I must add that I am a bit crap at diets and life is for living so probably twice/three times a month I had a big blow-out, or a night out, or a mahoosive one person picnic 
Just be prepared for some.... explosive bowel movements once you are settled in, there's a thread on Reddit that's quite good if you google 'what to eat on the OMAD diet' it comes up somewhere near the top as far as I know!