Gengis,
interesting stats and about what I would expect. Its slightly misleading in that with homebuilt/kitbuilt aircraft some people might register their kit when they order it, others not until it is finished, 6 months or maybe 10 years down the line. But I guess without going through all the PFA and BMAA new project registrations, this is the best data you have.
It is true that there are some new aircraft imported on N reg, such as quite a few Cirrus, but there are not that many other new GA singles brought in, most of the N reg Pipers and Cessnas that have been imported are second hand, a few new PA32s though.
There have been a few more new DA40Tdis delivered in 2004, but most were registered in 2003! 2003 also saw a lot more deliveries.
The Robinson number seems about right to me. There are almost no Robinsons in the UK on the N register and actually only a small percentage of helicopters are on the N reg, mostly A109s and MD600s. Surprised though that Eurocopter dont have more than 4 new helicopters delivered in 2004.
Homebuilts,Kitplanes and microlights are clearly taking over from the factory built aircraft. Not surprising really as they are more fun, have better performance and are cheaper to run.