I think someone mentioned a quirk around registration/ taxes that might push some deliveries after 3/31.
May be it was
@petit_bateau ?
It wasn't me. However it is true and I can explain for anyone interested.
It is because UK licence plates have/had a year code embedded in the number format. As a result depreciation patterns are heavily influenced by being either side of the date threshold, and thus so are buying patterns. The date threshold aligns with the annual government budget timing and this in turn also aligns with any announced changes to taxes/licence duties/etc associated with vehicles. Tax year is first week in April, exact date varies (there is a methodology to figure exactly when it will be, generally about 4-April or so) but the point is that it causes a lot of buyers to move purchases from Q1 into Q2.
It was once promoted as a way of encouraging short repurchase cycles by UK car buyers and so a benefit to UK automotive manufacturing. The harsh reality has been that for many decades it has instead predominantly benefitted the more up-market (mostly German - BAM) brands who can easily meet the fluctuating demand, and adversely affected local brands. Not that there are really any UK local brands left. Or much of any UK automotive industry post-Brexshit.*
My memory is there is now a sub-code in the licence plate that changes every six months to try and spread it out. It hasn't worked and is a daft non-solution due to the vested interests in opposing camps in the game. Personally I really don't care and don't pay any attention, but I'm a bangernomics person so the thought of buying a new car in the UK has never once crossed my own mind. Even my first Tesla will be used, hopefully in the not too distant future.
EDIT : the RHD Tesla's in the UK are all Shanghai (MIC) not Berlin (MIB). Apparently that is because Berlin is concentrating on minimising complexity until late on in its ramp. The consequence for Tesla in the UK is that shipments from China tend to be quite lumpy, and will probably become even lumpier when (eventually) ships from China start reducing (if ever).
* A automotive friend told me a few days ago he was checking through a whole list of UK 'racing' etc automotive industry players and almost all of them had relocated as a minimum their warehouse operations to the EU, and many their entire manufacturing business. The winners were mostly France, Netherlands, Germany. Core UK automotive is down over 54% since the Brexit referendum annoncement. He expects it to vanish completely. I think UK gov will bribe companies to stay with taxpayer funds personally. In my opinion ultimately Nissan will likely be the major beneficiary in the UK's post-Brexit BEV landscape, maybe also JLR, perhaps the BMW-Mini plant one day. He thinks everyone will simply pull out of UK. He is a real petrolhead who knows the scene much better than I do so I found his pessimism even more interesting than my personal cynicism.