Yes, and it is the most common successful model. Declare the secondary employment in writing, keep it off your rostered hours, arrange separate aesthetics indemnity (NHS cover never applies), and add the work to your appraisal or revalidation evidence. A weekend clinic day in a rented room is the standard starting shape.
The blended model is how most sustainable practices start, because the NHS salary funds the slow first year and the pension keeps accruing while your patient list compounds. The mechanics that keep it safe: written declaration through your trust’s secondary employment process, no NHS facilities or patient lists involved, separate indemnity from the first patient, and honest appraisal documentation.
Doctors in training have two extra steps, the Form R declaration and the study leave question (take annual leave for courses instead). The full operating manual, including revalidation for nurses and the one-day-a-week arithmetic, is our guide to aesthetics alongside the NHS.