Sure not how it actually works.
In practice we'll get a sell-on % of a sell-on %... and further sell-ons down the line if profit is made on future deals.
All we know is that it's a "Substantial" sell-on percentage of the profit.
The profit will be huge as we sold Viktor for £1 (ONE) million.
I guess the sell-on is 20-25%, but it may be more.