The full judgment can be read here (https://www.bailii.org/ew/cases/EWHC/Ch/2019/456.html)
Despite many solicitor firms asking process servers to letterbox the bankruptcy petition on their final attempt, and then making an application for a retrospective substituted service order, the High Court have ruled the Court does not have the power to make this kind of order.
The correct procedure has always been to provide evidence of evasiveness and request an order for substituted service. The Petition can then be letterboxed by Order of the Court.
For guidance with the correct process serve procedure in insolvency related matters, or to instruct a process server, contact ASH (UK) Process Servers Ltd on 01543 888218.