Ah, I'm sorry for my misunderstanding, David. That clears a whole lot of things up
In that case, something like what bsms posted would be perfect.
You might browse around on Amazon.com. They ship to Europe and have a very wide selection of nice, affordable bits. Here are a few of my favorites I've found on there and I think just about any of them would fit your needs. They are all mild with short shanks.
I've got one of these and both me and my horses really like it
I've never used one of these so I can't speak of quality, but I like the looks of it
I've never used one of these either, but I really like the looks of it too
This is the same basic style as one of my favorite bits in the world. I've yet to come across a horse that didn't go well in one like these
And don't let the price of this one fool you. I've used one of these for years and wouldn't trade it for anything.
And if you think your horse might like more of a mullen mouth instead of a port, there is always something like this
Also, Amazon does sell most of the Myler bits (the one that you were using before), but, like bsms, I just can't seem to bring myself to spend $100+ on a bit that isn't custom made.