Unless I overlook something, the impact of Brexit is likely to be negligible. Chip operates solely in the U.K., and leverages financial companies and infrastructure that are U.K. based.
It’s money is ringfenced by large U.K. financial institutions, which even the Bank of England recently stated are sufficiently stress-tested for Brexit.
One could argue that if it will do a crowd-funding round again in the wake of a Brexit, would this deter potential investors as they may have less spending power or a lower risk appetite. Even there I suspect it won’t matter - if the stock market takes a nose dive, alternative investments like crowd funding may be more appealing for many, even more so as most won’t put sizeable amounts in as is the nature of crowd funding.