Research - Find recruitment agencies for my job search

I am currently looking to move to London and I need to find a job in the city. I need an assistant to find recruitment agencies which place marketers in London OR are recruiting for one of the roles above, again based in London. The recruitment agency does not need to be London-based. However, the roles that they advertise and recruit for must be in London. My desired roles are DIGITAL MARKETING EXECUTIVE, MARKETING EXECUTIVE, GROWTH HACKER and very similar titles. It is your job to research this area and present me with a list of recruitment agencies which definitely match the criteria above. You should call the agency briefly to ensure that this is the case. There is no need to mention me by name in these phone calls. The list should have the name of the agencies, contact details for email and telephone numbers and would preferably be in an Excel file. If you do a good job of this then I may use your services again to help with further research very soon. I'm looking for someone to start work as soon as possible. If you are located in the UK this will probably be a big advantage. I expect this project to take (approximately): 2 hours online research 1.5 hours of 5 minute phone calls to the agencies 0.5 hours typing contact details into Excel