Shipping is now a guessing game, containers are being transshipped in a number of European ports as the major shippers require their vessels back onto a return schedule asap, the days of anticipating a route of a vessel have long gone. What used to be 40/45 days from India etc are anywhere from 70 to 80+ days, we have just rebooked containers for the 9th time from one vessels as the dates have moved so many times, so I would say let the guys tell you when they have cleared customs which will give a far clearer date of arrival at their warehouse and even if they disclosed the vessel they were on it isn’t necessarily the vessel they will arrive in the UK on, TBH it’s a nightmare at the moment