For the best possible analysis and for you to get the most rewarding feedback a photo of her whilst taking a shower would be far more helpful.
There's not much you can do as she's only dating him. But you need to make it clear that if they should get married, it has to be in a church/synagogue/temple etc in Southampton. And make him sign a legally binding contract that ensures any offspring will be brought up as Saints fans.
No, relax, it's a win-win. There are two possible outcomes; First, that the relationship finishes and then you can console her with the classic line,"look, there are plenty more fish in the sea, and most of them aren't skates". Or they become inseparable and every time your new "son-in-law" gets above his station, you can just say, "..and how are Pompey doing these days?" No problem at all. Just count the cutlery every time he leaves your house, and you should be fine.
Another little tip i would give you and your daughter,is never lend him any money,at best you will only get 20% back.
Having 4 kids myself you always worry about them and it's sad when they go off the rails. Luckily mine haven't been too bad, there's been a few worrying times, heroin addict, under age pregnancy, and pole dancing, but certainly nothing as sad and devastating as what yours has put you through. They just dont understand the pain and worry they put the parent through when they make these choices, the looks you'll get down the local shops, friends and neighbours will shun you. There should be a support group for parents in your situation.
I guess your daughter should try a bit of Missionary work, if that doesn't work, take up a new position?
I would suggest you drive down to Fratton park, and buy her a full pompey kit to wear. This will have two main advantages:- 1) it will help Pompey survive long enough to be humiliated at SMS in April. 2) it will give your daughter something to be buried in when you have shot her with "your father's gun" as the old song goes.
My niece has a boyfriend who was born and brought in Portsmouth. He supports Pompey from the distance of Cheltenham. Occasionally, when they're about, we play table-tennis. I used to be reasonably good at the game, and he is good enough to beat me about 50% of the time, so we get on well. I must say, he's a really nice bloke. He's not wedded to his mobile, and realises that real life is the adventure it always has been, not some virtual one. He's a modern, educated bloke, and if my niece was my daughter, I'd have no problems with giving any approval required. He also thinks Saints are Premier League material, so he has an excellent dose of common sense as well.
It's a good test...anyone who remains committed to Pompey during this saga clearly isn't the brightest bulb out there, but at least his loyalty cannot be questioned.