A web site has been created by the Lincolnshire Family History group called
Lincs to the Past
Amongst its information are Parish Registers for all the group parishes, click on Advance Search and type in name of village & Parish Registers, once the seach is complete hit the Show image button.
Mumby, & Cumberworth are easy to find as sole names however because there is more than one village of Willoughby & Ulceby, for quick results for Willoughby type in Sloothby and it shows as "Willoughby cum Sloothby" and for Ulceby type in "Ulceby with Fordington".
Downloads are available for a small fee.