We've had four of the things:
Woodstock - not named by me. Alan Bliault's old craft.
Woodspring - because it followed on and we lived in the ( abolished) district of Woodspring.
'Severn Surveyor' - it was an ex surveying craft ... with 'SURVEYING' plastered down the sides. Stopped a lot of 'what are you doing there ' questions.
Britannia - nice patriotic name for a British invention - and actually named after the P&A Campbell SRN5 (?) Britannia - long story but all to do with Bristol Channel and paddle steamers. My delusions of grandeur are not that great - yet :-)
Ross