I have the final parts of my car now listed for sale (all taken from a 2002 Vectra B SRi 150):
Firstly I will list the brake calipers - these include the Black Diamond Predator pads which have loads of wear left in them - they were fitted about 5-6000 miles ago and will last for a long time yet. The calipers came with the car and I have never had a problem with any of them:

Front:

Rear:

I am after £40 for the front caliper/pad combo and £30 for the rear (or £60 for the lot). Postage would be £14 front, £12 rear or £20 for both sets.
Alternator - fitted about 10,000 miles ago so plenty of life left yet, looking for £20 for the alternator along with £12 P&P (it's surprisingly heavy).

Wiper stalk - in very good working order - £7 + £3 postage:

Steering wheel airbag - very good condition with no marks - NOTE - this is for a 3-spoke SRi or GSi steering wheel - £20 + £8 P&P:

Payment preferred by direct bank transfer, although I will also accept PayPal and you are more than welcome to collect in person. Multiple items will be combined to save on postage and everything will be sent via Royal Mail standard parcels and I am open to (sensible) offers on combinations of the above.