Despite the overall political uncertainty about Brexit, worries
about a sudden stop to personal data transfers from the UK to the
US are misplaced, deal or no deal. There is, in fact, a plan, and
it's a reasonable, practical plan.
The UK government plans to use its regulatory powers to ensure
that prior arrangements between UK data exporters and data
importers in other countries continue uninterrupted. That
includes recognizing existing Standard Contractual Clauses between
UK data exporters and non-UK data importers. The UK government will
also recognize the EU Commission's Adequacy Decisions,
including the decision regarding Privacy Shield. So US companies
that import personal data from UK companies under the Standard
Contractual Clauses or Privacy Shield don't need to do
anything.