I don't think it is Billardia. The leaves are not right and the fruits are not the same shape.
Where are you situated emmarodriguezzz? Is this a climber, as that is what Billardia is and on your picture it looks more like a shrub? It may be worth contacting the RHS and sending them a picture and they will be able to identify it correctly for you.
Cacoethes: An irresistible urge to do something inadvisable
I entirely agree with Dove. These are not quinces though I have no idea what they are, I'm afraid. Quinces can be pear-shaped or roundish and their leaves have a slightly grayish look about them, but their fruit turns yellowish, never purple.
My Greek grandfather had plenty in his orchard, so I've known them since childhood. I love their blossom, the flavour of the beautifully perfumed fruit itself and the tea you can make out of their sun-dried leaves!
It reminds me a bit of Lilly Pilly fruit, also called Smithii or Eugenia. It’s the texture of the fruit flesh more than anything else. Sorry I can’t give a definite ident. 😏
Does the shrub have spines? It does look remarkably like Chaenomeles, or flowering quince, apart from the colour of the fruit. (Proper quince is indeed different, @Phaidra - it's Cydonia oblonga.) Even the cut-open fruit looks like Chaenomeles... has someone been out with a paintbrush??? I can't find anything like it on the Web...
Since 2019 I've lived in east Clare, in the west of Ireland.
Does the shrub have spines? It does look remarkably like Chaenomeles, or flowering quince, apart from the colour of the fruit. (Proper quince is indeed different, @Phaidra - it's Cydonia oblonga.) Even the cut-open fruit looks like Chaenomeles... has someone been out with a paintbrush??? I can't find anything like it on the Web...
I'll have a look for spines when I get home but I am based in South West England. Its really bugging me because I've been searching the Web for days and can't find anything! It's so weird
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
My Greek grandfather had plenty in his orchard, so I've known them since childhood. I love their blossom, the flavour of the beautifully perfumed fruit itself and the tea you can make out of their sun-dried leaves!
@emmarodriguezzz - are you in the UK?
Does the shrub have spines? It does look remarkably like Chaenomeles, or flowering quince, apart from the colour of the fruit. (Proper quince is indeed different, @Phaidra - it's Cydonia oblonga.) Even the cut-open fruit looks like Chaenomeles... has someone been out with a paintbrush??? I can't find anything like it on the Web...