<sod>The British government was looking to discontinue the operation of diesel-electric boats and offered to sell ''Upholder'' and her sister submarines to Canada in 1993.<ref name=Ferguson>{{cite book |last=Ferguson |first=Julie H. |title=Deeply Canadian: New Submarines for a New Millennium |year=2000 |publisher=Beacon Publishing |isbn=0-9689857-0-X |page=152}}</ref> The offer was accepted in 1998.<ref name=Ferguson/> The four boats were leased to the Canadians for US$427 million (plus US$98 million for upgrades and alteration to Canadian standards), with the lease to run for eight years; after this, the submarines would be sold for £1.<ref name=Wertheim>Wertheim, pp. 77-78</ref><eod>
<sod>The British government was looking to discontinue the operation of diesel-electric boats and offered to sell ''Upholder'' and her sister submarines to Canada in 1993. The offer was accepted in 1998.<ref name=Ferguson>Ferguson, p. 152</ref> The four boats were leased to the Canadians for US$427 million (plus US$98 million for upgrades and alteration to Canadian standards), with the lease to run for eight years; after this, the submarines would be sold for £1.<ref name=Wertheim>Wertheim, pp. 77-78</ref><eod>