Although not quite as important as Brexit (!), you maybe interested to know that the Law Commission has confirmed electronic signatures (e-signatures) are valid and can be used to execute documents. This includes when there is a statutory requirement for a signature. The Commission’s view is based upon both legislation and court decisions relating to non-electronic and e-signatures.
Alongside recommendations relating to the practicalities of e-signatures, the Commission has also set out an option for reform, in which the law of e-signatures would be codified, as this would increase the accessibility of the law. See here for further detail.