This first Theddlethorpe lifeboat, which was unnamed, was launched on service 10 times over a 35 year period, and is credited with the rescue of 27 lives.

[2] In 1864, the LCSA handed over control of their 6 lifeboat stations, including Theddlethorpe, to the RNLI.

[2] The third, and last, lifeboat to serve at Theddlethorpe, was again funded by Mrs Caslake and 'friend', and again named Dorinda and Barbara (ON 29).

A 30-foot Norfolk and Suffolk-class non-self-righting lifeboat, costing £145, and built by Beeching of Great Yarmouth, she arrived on service on 17 October 1871.

The lifeboat Dorinda and Barbara (ON 29) was relocated to Southwold No.2 station, renamed Quiver No.2.