Is it possible to collect two academic letters and one from my internship place as recommendation letters in UK for a Master's?

Yes, you can submit two academic recommendation letters and one from your internship for your master's application.

UK universities usually require one or two references. At least one should be academic; the second can be academic or professional. Including a letter from your internship is acceptable and can strengthen your application by highlighting practical skills and work experience.

Make sure all your recommenders know you well and can provide detailed, personalized insights.