I share some of the same problems, so I'll pass on what tips I can. This advice helped me, so it may be useful for you too.
Will power: Thinking of the biscuits constantly when you're not eating them, only to eat them later.
When you think 'I will not eat the chocolate biscuits' your subconscious mind doesn't hear 'I will not eat...' all it hears is 'CHOCOLATE BISCUITS!' so really, the whole time you're at work you're priming your mind to think of nothing but eating chocolate biscuits! If your mind frets about eating chocolate biscuits it's usually because you've caused a stressful situation where it thinks you will never have them again. You've created a chocolate biscuit famine in your subconscious so of course the primary thing it wants to do is eat as many chocolate biscuits as possible before they vanish from the earth forever! I found a tip from the Gabriel Method helped me with hankerings like that (I highly recommend the book 'The Gabriel Method' for reprogramming your mind to prefer healthy behaviours, by the way). Keep repeating to yourself 'Chocolate biscuits are always there, chocolate biscuits will always be there'.If necessary give yourself permission to eat chocolate biscuits tomorrow. Not tonight, when you get home. It's not like there will be a worldwide chocolate shortage overnight. There are plenty of chocolate biscuits in the world, so there's no rush to eat them right now. If you get home and feel like eating one, just repeat 'chocolate biscuits have always been there, chocolate biscuits will always be there' and tell yourself that you can have one... but not right now. Later. Always later. Because they'll always be there, after all.
My Wife....I love her dearly....but wish she would stop filling the fridge and cupboards with junk food.
This is a tough one. Often our loved ones sabotage our weight loss efforts, accidentally or on purpose. My only tip is to have a heart-felt conversation with her, asking her for her support in your weight loss journey. It's a big thing to ask her to give up her treats because you want to lose weight, but ask her to do it for your sake. After all, having you healthy will be beneficial for your whole family in the long run, so it makes sense for your family to take an active part in your new healthy lifestyle.
Contentment. I am happily married with a beautyiful little girl who is very hard to feed.
It's great that you have a wonderful life. Just keep reminding yourself that losing weight and being healthy will ensure that you have that wonderful life for many more years to come! If necessary tell yourself that you are losing weight for your little girl, not for you. She deserves a healthy role model so she doesn't grow up and become obese herself.
Money & Time...Two of the biggest killers for me.
Can you work more incidental exercise into your day? If you drive to work, park a bit further away so you walk part of the distance. If you can't do that, go out for a brisk walk for half of your lunch break. If you catch public transport, get off one stop further away and walk a bit extra. Take the stairs instead of the elevator. Buy some cheap hand-weights (or use water-bottles or tinned foods as weights) and build some muscle while watching television. A couple of old telephone directories taped together will make a perfect aerobics step so you can get some cardio exercise in your own loungeroom. Buy vegetables in season and fill up half your plate with salad or steamed vegetables, with one quarter left for protein and one quarter for carbs. I think it's great that you help your wife out. Can you work exercise into that? Do some lunges while you're vacuuming. Jog on the spot or dance while doing the dusting.
I hope some of these tips help!