This has been probably asked so many times, so apologies for being a NOOB.

I am looking at a 2006 RRs 4.2ltr supercharged with genuine 29K miles only on the clock.

Apart from a Transmission oil change (sealed for life? yeh, right) as I take it this age of vehicle has the ZF 6 speed gearbox?

what else (apart from buying a refinery) should I be looking out for?

Many thanks

Full service history, and maintained on time but i wouldn't be too concerned about main dealer or independent and always buy on condition. A low mileage RRS may not necessarily be the best buy. I'd get the old girl checked over at an independent to avoid, as far as possible big bills (apart from petrol, insurance and road tax ) in the first year. Any faults found can be a useful negotiating tool.

I'm sure some S/C owners will be along soon to give you their personal experiences. In the meantime get stuck in with the search facility on the site.

Best of luck.  FF 4.4 V8 Soooo looking forward to this bad boy
Ex 2006 RRS SC - garbage
Ex 2016 135i M Sport - dream car
Ex 2003 RS6 Avant - piece of cr*p
Ex 2014 320d X Drive, M Sport Touring - ok I guess
Ex 2007 RRS TDV8 - bloody loved it
EX 2007 FL2 XS - not so bad

We had issues with the super charger wiring which was causing the car every so often to go into limp mode, had it fixed as sofar touch would no issues since

Does yours have a sun roof as i hear these leak into the footwell Freelander SE - Gone
S1 Elise - weekender
Rrsport S/C Autobiography 10 plate -well and truely here, but now stolen

Recently purchased one obvious things to look out for is discs and pads, make sure to give it a good test drive and work the engine so it's under load as this will show up any knocking from the engine which could indicate bottom end issues, I read on a forum someone had an issue so thought I best make sure I check the engine thoroughly before I bought mine.

If possible make your can have the vehicle left for 24 hours without being started and make sure the vehicle height doesn't drop as this may indicate a small leak on air suspension and doesn't show up as a fault on the dash ... my range rover sadly has a small leak and is currently going through the process of being traced

Lastly have it looked at on a ramp as bushes are very common issue aswell and may need replacing

Goodluck