Just spoken to my dealer and they said it's not something they do.
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I picked up my new Leon today. Ordered end of Jan and was originally told to expect delivery in late April/early May. When it looked like it was going to be late March/early April I asked the dealer about registering in March to beat the tax changes.
He said that they'd do that if needed, but in the end it arrived late last week and wasn't needed. When we were doing paperwork today the topic came up again. He said that they're allowed to register it once it arrives in the UK, but not before. So the minute you're vehicle is driven off the car transporter, then that's the date apparently. There was no reason to tell me rubbish at that stage so I'd reckon on it being correct.
Dealerships usually have monthly sales targets to reach, so I'd bet that if your car is in the UK and they still won't register it, then that may be down to them having hit the March sales targets and wanting to put yours down as an April registration/sale as April is likely to be a lot quieter in terms of sales.
Still have a few days. Maybe go to the sales manager/franchise owner and see whether you can get some movement on that. Maybe you have a family member who might be looking for a new car soon and you're looking for a reason to point them to that dealer?