TSS Duke of Lancaster is a former railway steamer passenger ship that operated in Europe from 1956 to 1979, and is beached at Llannerch-y-Mor Wharf near Mostyn Docks, on the River Dee, in north Wales.

[3][4] In this capacity, the Duke of Lancaster travelled to the Scottish islands and further afield to Belgium, Denmark, Netherlands, Norway and Spain.

[2] Rather than undertake the expensive option of renewing their entire fleet, British Railways instead began a part-programme of conversion.

In order to maintain ferry services whilst these modifications took place, Duke of Lancaster's duties as a cruise ship ceased.

[5][6] On 25 April 1970 the ship returned to service, having had her main deck rebuilt to accommodate vehicles via a rear door at her stern.

[5] Duke of Lancaster was then briefly employed on the Fishguard to Rosslare crossing, before becoming the regular relief vessel on the Holyhead to Dún Laoghaire service until November 1978.

[2] Duke of Lancaster arrived in Llanerch-y-Mor, North Wales from Barrow-in-Furness, in August 1979 to start her new life as a business venture and retail complex as "the Fun Ship" to circumvent the-then sunday trading laws as it did not apply to ships, the owner John Rowley saw this legal loophole.