She was built purely to evaluate the tri hull system, believe the USA built some on a bigger scale, also seem to remember it was not long after the fat or slim hull design argument was raging. The 42 's were the long narrow design and suffered hull construction problems with cracking deep frames etc and had to be strengthen! But she did what was wanted, I expect they ran out of money to further the concept. Now the concept in the MOD is cheap as possible???