I think if multiple people in your postcode sign up it'll be split between you.
So if your postcode is drawn to win £25k, everyone in that postcode gets £25k each?

Wrong, for all the draws other than the monthly £3million draw (which is shared) the amount won is per ticket. So if your postcode is drawn to win £25k then all tickets in that postcode win £25k
.Yes, they get £25k each. The only prize shared is the postcode millions.