I used to be an avid and adventurous cake maker .
The only shops that I know of which have understanding bakery supplies are :
Divertimenti in Brompton Road London .
It began in the sixties and was unique then .
And one , which I tend to buy from these days :
Trevor Mottram in the Pantiles ,
Tunbridge Wells .
They also sell beautiful Nordic cake moulds , which I used to have to get from the US .
I think that they both
have a delivery service .
In the past , I've had a problem with entremet moulds .
I've not be lucky with Amazon and Lakeland , which have good quality items , but nothing new .
Good luck !