I've found it really interesting to read through this thread because DH and I often have similar thoughts to Chocolate Wombat!
We have a relatively small income but quite high mortgage repayments which we are due to pay for another 15 years. DH is 56 and I am 50. It's quite a struggle but we have learned how to be very thrifty. We overpay the mortgage by £50 a month. We can only afford our house because we don't pay into pensions. That was a specific choice we made, we chose to buy a house instead of paying into pensions as we couldn't afford to do both. Once I reach retirement age we plan to sell up and move to a tiny cottage hopefully somewhere nearish to the sea, maybe in Wales where property is cheaper. We hope by then to have a bit of savings to supplement our basic government pensions. But, as I say, we are used to living frugally, growing our own veg and making meals very cheaply. We will save a fortune once the DCs are independent! Although we hope there is enough equity when we come to sell to be able to give both of them some kind of lump sum towards a deposit for places of their own otherwise I struggle to imagine how they will get on the housing ladder at all unless they marry high above their station (he he)!!
We go without quite a lot but generally don't consider ourselves to be missing out. We enjoy doing things that are free (eg walking, playing games, reading). We have never had Sky, run one old banger, rarely eat out, don't go to the pub or drink or smoke. DH and I only buy new clothes, shoes etc when what we have wears out and I always scour the charity shops first to see if I can find what we need before buying anything new. The exception to this is whatever the DCs need although it is more what they "need" than what they "want". Non-essential clothes and treats etc are reserved for Christmas and birthday presents. Most of our close friends are in similar positions so we go to each other's homes for pot luck dinners and usually bring one course each. Holidays are scarce, maybe camping or staying with a friend or relative if we are really lucky. Lack of holidays/travelling is probably the one thing I would change if finances allowed. We do as much DIY ourselves as we can. I never buy magazines or daily coffees and our only credit debt is my train season ticket but I shop around for interest free credit cards for that.
Our friends say our house is beautiful, which makes me very proud, because it is mostly furnished with second-hand stuff (including bits from Freecycle and out of skips) or pieces bought very cheaply in sales. If I see a 70% off sale sign - I am in there! But have learnt to think very carefully before buying anything at all, and only buying what we really need. But we spend a lot of our free time in our home rather than spending money going out and so I feel justified in spending what I can afford to make it a lovely and comfortable place to be.
We use the local library for books, rent DVDs instead of going to the cinema and get our popcorn from the pound shop.
Our friends who do all the holidays, brand new cars, all the latest gadgets etc are able to do so because they have inherited money from parents and grandparents or else own their own businesses and make a lot of money and/or have good accountants who know all the tax breaks! I have friends who earn over £100k a year but (legally) pay less in tax than I do on a £25k PAYE salary. It's handy when you can claim that the massive widescreen TV, both cars, all your Ipads, laptops, clothes, meals out etc etc are all tax-deductible!
What posters say above about childcare costs is so true - having family members who are happy to look after your children is an absolute God-send financially. But not everyone lives close enough to grandparents to make this viable and not all grandparents are fit enough or willing to give up their freedom to look after yet another generation of children!