The optical zooms of video cameras that were released more than two years ago range from 1x to 60x. The HDR-PJ330 has a fairly big optical zoom (30 times zoom factor) compared to most of the other video cameras that were released more than two years ago.
It may also be worth also looking at one of the other 30x (optical) camcorders currently available including the HDR-CX330, or the HDR-PJ540 (£439.99) both from Sony which has better reviews.
If you would prefer a camcorder with a bigger optical zoom then you might want to look at the GZ-R15 (40x and higher rated), or the GZ-R10 (£157) (40x and higher rated) both from JVC.
What does "optical zoom" mean?