Need someone for regular SEO, SEM & Social Media activities

We are urgently looking for someone who can take care of our SEO, SEM and social media activities on an ongoing basis. You will be required to understand the technologies we are trying to sell B2B. The goal is to improve the natural ranking and quality score of our website for certain key words/phrases. We prefer someone who is UK based and can travel to London for an initial meeting. This is will be an ongoing role for which we prefer to pay a fixed monthly fee. Please send me a message showing relevant experience with case studies and I will send you details of our website, our technologies with example keywords / key phrases, SEM budget, etc.