I'm probably in the same position as you, and wondering the same thing.....
I have looked into this and after talking to a couple of airlines, some say yes, some maybe and some say no. the majority say that if they have a stack load of c.v.s in front of them....everone has a frozen ATPL..so they need to look at other areas. and this is when "where you did your training" may come into play. but usualy they start to look at the person. so the place of training becomes irrelelvent..
you should definitly consider oxford for your ATPLs, But as a self improver, THINK HARD...I've heard nasty rumours of oxford putting self improvers on the low priority list, and only concentrating on their airline boys, when they get behined on their instrument training hours
Hope this helps....
Mike.............