Speaking of marriage...it's different in the UK, but I understand in America it's expected that an LDS couple just had a temple marriage? Why is it frowned upon to have a civil wedding first and then a sealing?
I'm going to start big picture here, and then get to your specific question---
There is a legal marriage and a sealing: they are two different things. A legal marriage must be conducted by a person who is legally in authority at a place which is legally authorized. Similarly, a sealing must happen by must be conducted by a person who is in God's authority at a place which is authorized by God. One of the requirements to be sealed is that the couple must be legally married.
In the UK the laws are different and temple sealers do not qualify to legally marry people (I'm admittedly not uber familiar with the laws involved). Therefore, couples in the UK must get legally married first and then sealed, which is perfectly all right.
In the US, the laws allow temple sealers to be legally authorized to perform marriages in temple. Therefore a couple has a couple of options:
1) Get legally married and sealed at the same time, in the temple. This unfortunately means that non-temple-recommend-holders cannot attend the legal wedding (I'll talk more about this in a minute).
2) Get legally married outside of the temple, wait a year, and then get sealed in the temple. Why must US couples wait a year between this and UK couple do not have too? It's a church policy thing. Does that mean it's of God? No, it is simply a policy. Many LDS folks (myself included) disagree with the policy and believe it should be abolished. This disagreement with Earthly human policy does not effect our standing in the church or in the sight of God. Admittedly there is a flawed-culture of people disapproving of this option- such is outright sinful in my opinion (we humans are sinful creatures).
3) ***This is the most popular option in the US*** Get legally married and sealed at the same time, in the temple. Then have a "ring ceremony" outside of the temple and do all the cultural traditions with everyone.
I've read a lot of stories of distraught father's who couldn't walk their daughters down the aisle?
A LDS dad attending his LDS daughter's temple wedding also doesn't walk her down the aisle. In fact, there are no aisles in sight for anyone to walk down.
Cultural traditions associated with marriage (walking down the aisle, exchanging rings, cake, bouquet tosses, etc) simply aren't part of the sealing ceremony: they are part of culture. That's why even among fully LDS families in the US tend to have a "ring ceremony" after the wedding: to celebrate in the context of Earthly traditions. That's when the bride walks down the aisle with her dad (regardless of his faith), the couple say vows to each other, exchange rings, eat cake, etc.