I am inclined to be with you, minimo and say 's*d it' but think that you do know the answer to your own question! If you really are two stone overweight, start now as some of your excess weight will be water and the first half stone will probably drop off quite easily.
Once you have the impetus of that early weight loss, you can keep to a 5:2/low carb/whichever weight-loss method you choose, and keep on going until you are where you want to be.
I quite enjoy calorie counting as it suits me. Mentally keeping to less than 1400 calories a day means I can enjoy everything - but less of it. I know the value of most food, and it is really simple. The additional benefit of this regime is that if I am over for a day (out with friends, etc.) I can rein it in the next and thus overall keep to where I want to be. I feel in control.
I will probably put my 'diet' (although I hate that word, as it is really a new way of eating rather than a diet, per se) completely on hold for the festive fortnight and just pick up where I left off in January. I don't want to have to say 'no' to everything offered to me (it's OK in one's own home to choose wisely but more difficult when in others).
Whatever you choose, have ago at it now - don't wait or you will have a miserable time over the festive season. Just do it! Good luck.
PS
Don't go into the food hall of M and S if you have a sweet tooth. Their chocolate biscuit/chocolates are on offer and I have to steel myself not to buy (my weakness). If you are not in the shop, you can't 'accidentally' buy them!