Why would Brexit affect the EU's GDPR legislation that already exists? Perhaps it could change in Britain, but it would still exist in the EU, where the legislation was approved and is currently being enforced.
The bigger problem is that the UK won't be able to be certified as having adequate protection due to the Snooper's Charter (or, rather, any adequacy decision will be almost instantly sent for judicial review).
I think our politicians have forgotten how much we got away with by doing it after we joined.
I thought my question was fair so i don't understand the downvoting.