Restrictions on dredging
4. It is an offence for any person to carry out dredging except where the dredging —
(a)falls within one of the cases described in regulation 5 (when these Regulations will apply in relation to the dredging only to the extent specified in that regulation in relation to the particular case); or
(b)is carried out under and in accordance with a permission granted under Part 4 of these Regulations.