[petrochemist]

I got something similar shortly after my first my DSLR. Even with a 6MP camera cropping produces a significantly better image.
With a bridge camera you are rather restricted in options to improve the zoom range, but most modern bridge cameras have quite a good zoom these days. The down side of which is any flaws in additional optics will be more noticeable. You may be lucky and find something up to the job, but I doubt if it will be under £70. Unless you get the chance to try it first, I wouldn't bother with any without loads of impartial, good reviews.