If you seriously want "roms" to play you have plenty, plenty of choices, for the beginning, you could use Ninjhax 2.0 to allow you region free in your games, and since you apparently live in England, i suggest you to find an original copy or digital of Cubic Ninja to run that program, you can also load homebrew in there.
The second option is to rewrite the rom and change the region of the game, for example, let's just say that you want a japanese game but is region locked, you could simply change the region with an specific program, i've heard of some programs that can do it, but is not always effective, you can either hit or miss, so, it's like a double edge sword.
Lastly, is to download cias, and then, convert them to .3ds, cias are way, way easier to find than 3ds roms, ironically, but to convert them is another thing, you'll need programming experience, and you must unlock everything that is packed into the .cia, is not easy, but not impossible, there isn't a program to do it automatically, so, you gotta have to do some steps apart to unlock the content and reconvert it to cia.
In my humble opinion, i suggest you the first option, if you can pay to download roms (Which is stupid) you sure can pay for a copy of Cubic Ninja, and remember, if you want to download roms, do it with a good server, like MEGA or DF, don't trust surveys, you're going to be scammed if you put a survey, the people who do it is almost as stupid as the people who believes that a CFW past 3.55 OFW for the PS3 exist, the only thing we have is Pexploit for the moment so, just take my word, find a good and stable place where you can download with all the security, especially a forum dedicated, or a blog, anything that doesn't have a survey or "Premium accounts", that's just stupid, and finally, you don't need to install programs that allow you to download 3ds rom automatically, you just need to look straight, and know what kind of sites are the ones you want, i recommend you the ones that doesn't have too much publicity, they're usually a lie for the consumers.
I don't have a Sky3ds, but this is the help that i can give you, it can be stressing, but instead of throwing money to solve the problems, do it for yourself, experiment, try to prove different ways, make a list about the possibilities of this or that, you just need to do it for yourself, don't depend on others, i don't know the quality of the 3DS, but i'm sure as hell that is not a problem that can't be countered, you jut need to focus what is wrong, and what is right, and work to make it work, period.