Can you post a pic of where the leak is. If you need to get it soldered I would think £45 - £90 to get it done. Should only take someone about 30 mins from arriving to finish, quick end of day job .
trace the feed wire back and test where you can for voltage I would suspect a problem around steering column from when you changed ignition switch, have you got a feed to the column switch?
motor bikes dont have front plates.
Technically it should be mounted on the vertical surface nearest the front of the car. So get a plate and grind it out to the shape of a speed hump and stick it on front crossmember ( a damaged plate or missing plate will only get a report to mot station and pay for test and then a producer at local nick).
This was just a simple mistake just. Hope my name was on the list and it is flying round the internet being published on servers world wide, that will help promote the business website.