This particular one was £50k investment for 9% equity, plus they send an additional £50k to the company, which is transferred immediately as a "service charge".

Writes off £50k of your SEIS allowance as a business, which as I'm sure you know is like gold dust for the first £150k, as 50% of the investment can be written off against investors income tax, then a further 30% if the company fails.

If the company succeeds, the investors pay no capital gains on sale of shares.