I used one of these
Ballast
And one of these
Connector
And finally one of these.(only need 1)
Power supply wire
The one that was blown on mine was UK driver side where the ballast is attached to the lamp, the new ballast wont fit onto the lamp so it needs to be placed somewhere behind the lamp. Wires was run true the hole where the old ballast used to sit and silicone was used to seal it.
if i'm not 100% sure but on UK passenger side i think the ballast is placed away from the lamp so that will make this easy and cheap fix easier.
Reason for going with this solution was:
-Unsure if the ballast or ignitor was broken
-To expensive to buy brand new and a used is over priced.
-It seemed that getting the ignitor out would be a pita of unknown dimensions.
Been working smooth for 1.5 years.
You can also use any 35w "slim" ballast but my experience is that they tend to stop working after a while