The above answers are very sensible. You cannot go on price alone. You must feel comfortable with whoever you see, understand the treatment that they are proposing, be aware of the risks and benefits, be aware of alternative treatments and understand the costs involved.
The costs of a bridge can vary considerably, mainly depending upon their size, materials that they are constructed from, the quality of the laboratory work, the practice overheads, and whether the practitioner is a registered specialist.
Asking if £3,300 is correct for 'a bridge' is a bit like asking if this is correct the correct price for 'a car'. I can't really answer that - sorry.