[marapu]

www.joinef.com [entrepreneur first] has been wildly successful with this model since 2012. They pool together founders pre-idea a couple times a year and have them start companies together in batches. If you get investment I believe the deal is 80,000 GBP for 10% - aggressive deal but worth it considering their network.

[pedalpete]

https://antler.co has a similar model