re: Getting Tickets When Traveling

I am traveling to London next week and decided to take a chance on secondary market tickets. I bought a pair for Arsenal v. Burnley on the 17th from Stubhub. They will not deliver the tickets internationally, so I am having them delivered to my hotel a few days before. I coordinated with the hotel and this appears to be a common occurrence to them. I bought the tickets last Friday, and not gonna lie, it was pretty expensive, but I figured this is a once in a lifetime experience.
One strange thing is that I will have to return the tickets after. I am assuming that the tickets are used for multiple games, but not sure why?
I have a co-worker that was a season ticket holder for Arsenal before he moved here and he suggested Stubhub. He said the low level membership with the clubs have very few tickets released for each game, and if traveling for only one game, your odds are not very good.
I'm happy to report back after and let you know how it goes.

ETA,I have seen the warnings about buying secondary tickets, but was still willing to take the chance. I figured charging to Stubhub on my CC, I would have some sort of recourse if things didn't work out.

On the other hand, if there are any Arsenal fans that could give some advice on game day things to do/see. I am a casual fan at best, but I thought this was something that I may never get another chance to experience. Oh, and I am also traveling with my teenage child, so any suggestions that are appropriate would be appreciated.