Today we went to fit some mirrors to the Bladester only to find that due to having a full cage, the blinding things don't fit in a way that , conforms to SVA requirements AND looks aesthetically pleasing.
We were using a pair of CBR400 mirrors (they were cheap), is anyone aware of a set with either longer arms or more rotational adjustment
Any help would be appreciated

The cub70 mirrors might do the trick. They've got very long arms and are adjustable for angle..... They're not terribly expensive either (infact, I just sold a pair on Ebay brand new for 10 quid including P+P).

They have a known SVA track record...