Freelander 1 Service kits, genuine or aftermarket?

I am looking at service kits on Rimmer Bros for our new TD4.
They list
Land Rover Freelander Service Kit - 2.0 TD4 VIN 2A218130 on LF1088 £137
Land Rover Freelander Service Kit - 2.0 TD4 - Aftermarket VIN 218130 on LF1088P £37

It seems a huge difference in price. How good or bad are the aftermarket ones?

and then there is the forum sponsor Famous Four with

FF006565 "premium parts" £35.50+VAT

have a look at .. http://www.opieoils.co.uk
they sell MAHLE filters

https://www.google.co.uk/?gws_rd=ssl#q=mahle+filters+any+good

Nowt wrong with after market items I always use these below.
http://www.ebay.co.uk/itm/121145898705?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT

get the oil from carpartsforless
http://www.carparts4less.co.uk/cp4l...d665a2a221ff21e868b41b3fba0187e4da19d9&000398

And fuel filter if you have the under bonnet one ?
http://www.carparts4less.co.uk/cp4l...9658f945dbc09d4ce6454d66d76664413d9344&000140

if behind wheel arch
http://www.ebay.co.uk/itm/Land-rove...210508?hash=item3ab248ad0c:g:rn0AAMXQaOVRkh8A