If you require a beach chalet in Whitby, then you will need to get in touch with Scarborough Borough Council.
For seasonal/annual chalet enquiries and bookings in Whitby, call 01723 232323
For weekly chalet enquiries and bookings in Whitby, call 01723 513852
Email any queries to: firstname.lastname@example.org
Follow the link to the borough council information page, below.
From that page you can also make daily and weekly bookings via their booking portal.