The horn is located in passengers wheel arch under the bumper, bolt is size 10 socket, the connector is usually a bit sticky so give it a bit of a wiggle and it should come free. Horn is readily available on eBay priced at around £4.
Hope that this is helpful to you buddy 😁😁
Hi Andrew go to ebay and search for Lupo front grille support, you'll find loads there, I purchased one for mine, the set cost around £65 that includes the grille and grille support were the indicators go.
Hope that this is of use for you buddy 😁😁