Ahhh UK Regulations I remember them!
And to add insult to injury once jumping all the hurdles proving its a safe kit you won't be able to perform the first flights yourself unless you are a designated test pilot.
Additionally the UK Regulators will want to go for a jolly in it every year to ensure it meets requirements. Think travel expenses, daily fees and pre flight inspections.
Given all the regulations and expenses in having other people fly 'your' helicopter versus your own flights you might wonder whose helicopter it is.
It's probably going to be cheaper and more reliable to operate a certified type! Find a nice Enstrom and give up hope of building or innovating in the UK.
OOW