The roads around here are pretty torn up at the moment, and while driving home from work the other night, a rather inconsiderate driver coming the other way forced me to the side of the road - where there's a large pothole (~12" across & several " deep). I noticed today that the front passenger side tyre is bulged, probably about 1 cm proud of the sidewall - it looks like a marble is trying to push out.
Anyway, the car's a Ford Fiesta Zetec (60 plate) with ~7000 miles on the clock (bought in Dec 12 with 4k miles), and has 195/50 R15 Continental Premium Contact 2s all round (original set I'd think). Here are pics:

Click to enlarge

Click to enlarge
I believed that any bulge would mean a tyre replacement, am I right to think this? Also, with 7k miles, will I need to do both fronts, or am I ok to replace just the bulged one?
Anyway, the car's a Ford Fiesta Zetec (60 plate) with ~7000 miles on the clock (bought in Dec 12 with 4k miles), and has 195/50 R15 Continental Premium Contact 2s all round (original set I'd think). Here are pics:

Click to enlarge

Click to enlarge
I believed that any bulge would mean a tyre replacement, am I right to think this? Also, with 7k miles, will I need to do both fronts, or am I ok to replace just the bulged one?