Just to add my two-penneth...
I own a Nipper and for me it really is the most fun per pound I can have in the air. I charge myself £24 per hour which breaks even on AVGAS and makes a little for a fund on MOGAS. Normal 'after work' trips are around 30 mins, so for £12 I have a ball!
I operate in quiet airspace and am in the 'aeros' area in just 5 mins after take off.
There is a Nipper for sale on AFORS at the moment (most definitely not mine!) so for the financially challenged aeros fan there are options.
The aircraft is easy to live with, easy to maintain within the LAA scheme, and when coupled with a well put together engine and ignition system (1834 VW and leburg on mine) they are reliable and safe. Gone are the days of wonky mags and regular forced landings.
Roll rate not up to Pitts levels, but I dont need that. I do not intend to compete with it (yet..) but it could hold its own in beginner class competions.
Long live the Tipsy/Slingsby/Fairey Nipper.
CRX.