Although mine is an A250e Premier Plus hatchback in denim blue, I'm in a similar position. Believed to be built on 18 May with a VIN and expected in UK on 4 June, last I heard (a week ago) it was still in Hungary, with no explanation for the delay. Trying to get an update from the dealer.Ordered A250e Premium Saloon Denim Blue on the 26/3/2021.
The salesman gave me a copy of the Oasis order sheet which stated build date of 14/5/21 with eta to dealer of the 4/6/21.
Both dates have been and gone and now the salesman can see an Oasis order update of build date 7/6/21 and a chassis number has now been allocated which he thinks is a good sign, So it’s a wait and see game I am afraid. No reasons are given for delay other than probably Covid related.