Hey, mate. You could contact these guys
networklondon.co.uk. Have a close friend working there. I’m a UX/UI designer who owns an agency, so I always ask them for help. I’d highly recommend you define your needs and budget first. That would save both your and their time. As far as I know, they respond really quickly. Btw, you could also look through Upwork and Fiverr. There are lots of agencies that are ready to solve your business problems too. Anyway, I hope I’ve helped you. Contact me if you have any other issues. Wish you all the best, mate. Good luck.