Here what I fond on VW official website:

If you buy a Volkswagen Golf S model you will get a total of £3,950 saving off diesel engines and £3,250 saving off petrol engines. This saving includes the £1,000 incentive from the Government.  This means you can now buy a new Golf S 1.4 80PS 3dr from £10,335 in conjunction with the government scrappage scheme. (Golf SE, GT, GTI and GTD models will continue to get the standard £2,000 scrappage scheme incentive).

Volkswagen are also offering a total of £4,250 saving off all models in the Passat range, including Saloon, Estate and CC.  This saving includes £1,000 incentive from the Government.  This means you can now buy a new Passat Saloon from £12,190 in conjunction with the government scrappage scheme.

But what about my old car?

To be eligible for this saving your old car must be scrapped under the new Government scheme. Your old car must have been registered on or before 31st August 1999 and you must have owned the car for a minimum of 1 year. The Government and Volkswagen will then contribute £1,000 each towards the price of your new Volkswagen.  The scheme will help remove older cars from our roads, replacing them with safer and more environmentally-friendly models.

Please contact your local retailer for further details of this scheme.

Government Scrappage Scheme – Full terms and conditions:

The Government Scrappage Scheme offer applies to vehicles registered to private retail customers. The scheme is available from 5th June 2009 until the Government funding expires or until 28th February 2010, whichever comes first.

The vehicle traded in must be a car or van registered on or before 31st August 1999, weighing up to 3.5 tonnes which has been registered to you continuously for 12 months before the order date of the new vehicle. You must have a UK address on the registration certificate and a current MOT test certificate and have no outstanding finance on the vehicle before the new vehicle is ordered.

The discount will be offered against new retail vehicles which are first registered in the UK on or after 5th June 2009 and declared new at first registration in the UK with no former keepers.

The Golf Mk4 was first introduced in August, 1997, followed by a notchback version (VW Bora or, in North America, again VW Jetta) in August, 1998 and a new Golf Variant (estate) in March, 1999. There was no Mk4 derived Cabriolet, although the Mk3 Cabriolet received a facelift in late 1999 that comprised bumpers, grill and headlights similar to those of the Mark 4 models. New high-performance models included the 3.2L VR6 engined four-wheel-drive Golf R32 introduced in 2004, a 2.8 L four-wheel drive Golf VR6 4Motion version available succeeding the Mk3 VR6 which used a 2.8 L VR6 and only had front-wheel drive, as well as the famous 1.8T (turbo) 4cyl. that is shared between Audi and VW models.

As of 2008, certain variants of the Golf/Bora Mk4 are still in production in Brazil, China, and Mexico. Revised versions of the Mk4 are currently on sale in Canada marketed as the City Golf and City Jetta. The two models are VW Canada’s entry-level offerings. They received a significant freshening for the 2008 model year, including revised headlamps, taillamps, front and rear fascias, sound systems, and wheels. Both models are offered only with the 2.0 L SOHC 4-cylinder gasoline engine, rated at 115 hp. They are the only entry-level offerings with an optional 6 speed automatic. The production of Golf Mk4 for the US market ended in 2006.