Will it fit the standard plastic gooseneck or does it need an adaptor?
It will fit the standard angle adapter or our G-Fit range.
Hope it lasts twice as long as the vikans.
You still failed to answer whether its without vat and delivery , but I'll take the non answer as it's without.
That's Brush £29.99
Shipping ...... £3.00 (based on your 230g supa lite)
VAT................ £5.77
Total......... £38.76 
I'll have 10 
Sorry forgot that bit of the question, heads a bit fuzzy today!
Yes it is without delivery or VAT. As you demonstrate it is not cheap to buy, but as with most things you get what you pay for. It will only really appeal to certain buyers and these will no doubt feel that it is worth it.
Will it last twice as long as a Vikan? I doubt it as the Vikans are pretty bullet-proof, which is their main problem. I am confident though it will last a good couple of years and during that time will prove to be twice as efficient at the job of cleaning windows as a Vikan.