boiler certificate

hi,

my likamobile is steaming weekly from december 2011.
the boiler certificate is made november 2010.
when do you have to do a new boiler test in the UK ?

if i go to gdsf this year with the lykamobile - supossed they like me to come as an exhibitor-, what kind of certificate do i have to show at the admin. ?
Does anyone has some experience with it

best regards

roel

Here in the USA, on steam cars and steamboats the boiler is tested once a year, this is done the first time of the season. A hydro test is done by the owner. There is no certification that I know on this type of vehicle. On boilers over a certain size of heating surface it has to be certified. On stationary boiler its a different case, the boiler has to be tested and certified.