Not sure where you got the UK numbers from. According to the official government figures: 2014Q2 was 192 , 2014Q3 was 282. 2014Q4 figures are not yet released.
You can download a data dump straight from the UK government, or see this site for a quick (and accurate summary, I checked the two were correlated).
TESLA MODEL S - How Many Left?
The Q3 figure included a lot of pre-orders. The car officially released in June (Q2) but the bulk of pre-orders went out in July after the first service centre opened (Q3). It will be interesting to see how the official Q4 figure shapes up, and see what "baseline demand" there is after the initial rush.
Yeah, I estimate by using the SMMT data for "other" and removing 65 per month since the "other" category has more than just Tesla's. That method means 267 in Q4 with a total of 741 for 2014.