"On a household income of around £100K we are comfortable but not living the life of luxury some might assume."
This brings us back to the definition of "comfortable" though. I feel "comfortable" if I get to the end of the month without having to choose between food and petrol. This usually doesn't happen, and we spend a week living on beans and eggs,waiting til payday to fill the fridge.
A "luxury" to people like me is going out for a coffee, or to the cinema, or to a museum. We never eat out, never go on holiday, never buy new clothes (we wait for birthdays/Christmas and ask family for clothing as gifts).
But I would assume that these things and more - perhaps the odd holiday, even in the UK, or monthly meals out - are "normal" for those feeling squeezed on 100k. They would cope on far less, most of us have no choice but to do so.
Also, savings. Someone upthread said they are "squeezed" on £140k but save £500 a month. This is a luxury, as it gives so much security. The car goes wrong - no bother, there's savings to pay for it. If our car goes wrong, we have a crisis on our hands. As Jarvis Cocker said, being a Common Person is living your life with "no feeling of control." There's no financial cushion.
And fwiw, we're much better off than most. I earn too much to qualify for tax credits, for example. But mumsnet is a parallel universe sometimes, and this is one of those occasions.