I don't know gloucester, but I'd agree with everyone AND particularly the last 2:
You're not comfortable - go around, your minimums are your perogative, don't be pressured. You may have been a bit nervous, but there's nothing wrong with that at all.
However, in a busy environment it's possible to safely stack aircraft in pretty quick and close if everyone's confortable. It's not unusual in my experience to be at 400ft(alt) on final with another a/c landing ahead of you still airborne. Just because it can be done doesn't mean you should do it though - like so many things it's a matter of judgement, and what you're happy dealing with.