There are many approaches but often times Gatekeepers are not actual gatekeepers, they might be colleagues of your prospect that simply happened to pick up the phone. Don't pitch them, but ask for help, more often than not, they will give you suggestion how you could reach the person you are looking after or recommend a better person to speak with :) Also, be aware for some of UK gatekeepers that work as shared space office managers, they share google doc with other gatekeepers where they type down company name and SDR name who has been reaching out. In one of my previous roles, we had quite large sales team and there were companies that were able to list 11 SDR names that has reached out within 3 years :D