Hi, My 2006 Peugeot Executive has xenon dipped headlights. The handbook says on page 144 that the bulbs are D2S-35 W Xenon and that they must be replaced by a Peugeot dealer. The local Peugeot Service Desk tells me that these bulbs are very expensive to replace - about £100 was mentioned. However in my local Halfords the assistant told me that the xenon bulbs they sell at the current special offer price of 2 for £15 would be a suitable alternative. He referred to the fact that the manual quoted H1-55 W was the halogen bulb and the H1 Halfords' xenon bulb was the same fitting. My questions are: What's so difficult about changing these bulbs that the manual doesn't describe how to do it? Are the Halfords' H1 bulbs really compatible. Thanks David