I had a look at the "blank buster buzzers" at last years BFFI and had a good chat with Sandy about them......... A really nice chap, entertaining and clearly a good fisherman.
Bloomin £££ but he's a british businessman who needs to make a living. The flies were all well tied, good proportions and look like they'd last!!!
He obviousy didnt disclose the "secret" but here's my take on them:
Tie you buzzer very slim to represent reality, 8/0 or 14/0 if you can get it.
Use the finest wire possible to give a realistic segmented body.
For the thorax / hot-spot / head, begin with a glossy white thread base and cover with your chosen UV treated thread, to greatly enhance its luminescence (probably the wrong word and spelling

) compared to tying over a dull or mat colour as we may normally do.
The jury's still out on the whole UV thing for me. Blank busters certainly won't gaurantee a catch............ However, my favourite and most confidence fuelling buzzer does use a UV rib
Rod