Best way of connecting 10mm push fit to 15mm brass

[FizzPop]

My hot and cold supply is 10mm plastic and my tap has come with 15mm flexi pipes as pictured. What’s the best way to connect these?

Thanks in advance.

 

[terryplumb]

2 Compression reducing couplers 10 to 15 mm. ( screwfix code 51238)
And two flexible tap adaptors 15 mm to 1/2 inch bsp ( or 15 mm to 3/8 bsp). Cant tell from your pic what thread the flexible hose nuts are , probably the 1/2 inch. And your plastic pipes should have stiffeners inside.