MBG, you seem to have one hell of a big chip on your shoulder, sit yourself down and have a cup of tea, the way your going you will be having a heart attack.
Your gripe is really that you thought you were being ripped of by Hetas Installers, yet you have been knocking every reply from the tradesmen on here, all who have given you good advice.
First you havent gone the Hetas route, thats your choice, so you state that you have fitted it yourself, without informing bco, and no certificate of compliance is issued.
Should you have a house fire related to the stove, you will find your house insurance void.
If you came to sell your house, this would be picked up, only 2 weeks ago, I was with a client that was purchasing a property, one of the things picked up was, the stove and flue was diy fitted, no certification.
I was asked if my Hetas installer, (and yes there is a good honest one in Glos ) would certify, he refused saying although he can see the register plate and top of chimney, he cant certify the quality of the liner, or if there are any joins, therefore if he did, the onus would fall on him should anything happen, (thats honesty ).
I suggest you pay the fee to bco and get it certified, if only for peace of mind.
I know you will reply, the same as you have to others on here, with abuse, but how would you feel should you have an accident regarding the stove and your family were in the house.