There's a few forum posts on here debating the validity of a degree from OU compared to a brick university. When it comes down to it, a degree is a degree and wherever you get yours from, you will have done as much work as anybody else. On top of that, you will have studied and worked at the same time which is no mean feat and I can't see why that would ever work against a person in interview.
As for a specific degree, look at the factsheet and see how you feel about the modules that are going to get covered. If the topics are comparable, then there's no reason why your OU degree would be any less valid.
Here's the one for your course, though you've probably already seen it
And actually passed?