Weetabix Diet: Can I just eat Weetabix and nothing else? Stupid idea?

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I'm currently 18st 10lb & 5ft 10'. I have a BMI of 37.5 and according to the NHS website I have more than 6 stone to lose to get into a healthy weight bracket. I have no illusions; I realise that I have no chance of reaching that weight with this diet, and I get that it isn't sustainable long term. I just really need an kick-start to weight loss to help motivate me into believing I can actually achieve a half-sensible weight.

I have tried WW, along with other various diets and I'm awful at them, I have no willpower. I'm a very picky eater. I hate raw veg, most fruit and most 'healthy' foods. I love carbs, carbs and more carbs, and chocolate too. I am aware how bad this is, but changing is very difficult when I hate practically everything that is in a healthy diet.

The only healthy thing I like is Weetabix, in fact I love it! With full fat milk and white sugar (not so healthy anymore!) If I had to pick just one meal to have for the rest of my life, this would be it.

So here is my question, How long could I realistically eat a diet of 12 weetabix a day, a pint of full fat milk and about 30g of sugar? 2 weeks? 4? Longer? Would I need to add anything else in?

I am happy to take vitamin supplements, and I already eat 4 weetabix a day (and have eaten 8 in a day before) with no bowel problems.

Any dieticians (or anyone really!) out there who has any idea?

After a horrible accident at a grand old age of 8yrs of age I stopped eating food stuff that I previously enjoyed prior to my accident. As a result of this weetabix was one of the food items that I would still eat, I had at least twelve a day sometimes more but I always ate fruit. Two litres of milk per day. I lived on that diet till aged 22yrs never overweight or I'll and always active.I had no meat during these years. It never did any harm I'm in my 50s, salt and sugar also went from my diet still to this day