SK 3378 30 March 2022: 5 very high res. images

Location: National History Museum, London 
Altitude: 10m.
Date: 27 March 2022
Habit : Cultivated 

Is it Skimmia…?

Skimmia japonica Thunb. ??


I have been thinking.
Have ruled out most evergreens in UK
Sorry but never seen a Skimmia in UK that looks like this.
Nothing seems to fit with any Skimmia that i know.

It might be an Ilex species or cultivar.

Sorry but I do not think it can be Ilex.

Mystery flowers have 5 petals.
While Ilex have just 4.