Hi @MrsDeadlock I am in healthcare in London. I’m senior but don’t have a formal leadership or management role, so I will comment on what I see other managers wear.
Most female clinical directors or senior managers here (NHS Trust) don’t dress particularly expensively or stylishly. Many cycle to work so dress casual but with a smart touch, eg nice jacket.
If you are in the NHS, I would say avoid anything remotely flashy or that has a recognisable brand. As you know, many people in the NHS work hard but don’t get promoted out of relatively low- or average-paid jobs, so a clinical manager dressed in all over silk with high heels and Hermes bag would send the wrong message. I know that’s not how you want to dress, but I’m exaggerating for effect here 
The best dressed senior women in my Trust wear relatively fitted or structured clothes (not tight, of course), nice but understated jewellery (nothing too dangly as it’s against hospital policy) and little but flattering makeup. A good haircut and style are also key.
I suggest investing on a couple of really well-made jackets and shoes. If you like brogues or flat boots I suggest Church’s - it’s expensive but not flashy, and the quality is undeniable. I also like Ferragamo flats or low heeled pumps, but they do have the brand name on them which is a bit distracting and maybe a bit flashy. Gucci has good loafers and most styles don’t have any recognisable logos.
For jackets or blazers I suggest Isabel Marant, either the main brand or their sister brand Etoile. I have a long black blazer by IM and literally every time I wear it I get compliments.
Matt and Nat bags are actually very good quality. I have a leather-look backpack for my laptop and people always comment on how nice it is. Their styles are very nice, particularly the structured ones.