This £245 isnt in anyway a payment of compensation, although VW would like for their customers to think it is. They are simply giving back money for what Foglights cost as an option, they haven't fitted them so how on earth can they charge for them ?
Compensation would be on top of this, for example to acknowledge you may have a car that is worth less than ones with foglights in the future. Unless you really prefer the car without foglights, I would not be accepting £245.