We need to sort this out officially.

[Paradise_Alley]

I've always known it as Breakheart Hill rather than Heartbreak Hill.

[sarek7]

I always thought of it as Breakheart Hill but a family walked past earlier and were talking about Heartbreak Hill, not that I'm an eavesdropper you understand. Young sarek pointed out that it was Breakheart Hill, I was too cold to care at the time. I posted the two options as the seed of doubt had been sown.
Anyway, vote has been cast.

[2020 Phoenix]

Breakheart Hill.

[Fortytwa]

Breakheart hill is in the woods behind the garden centre at Millbrook. Its recorded on the OS Maps

http://www.geograph.org.uk/browse.php?p=213494

I always understood Heartbreak hill was in Russet Plantation

In the army most hills troops use for running up and down are known as bastard hill.