When a beneficiary dies after the testator but before the estate is administrated?

Trusts Discussion
1

I am looking for the piece of legislation and/or case law which confirms that when a beneficiary dies after the testator but before the estate is administrated (there is a will); the beneficiaries share passes by virtue of her estate (rather than it being considered a failed gift?)
Thanks

2

Try:
Sudeley v A-G [1897] AC 11
Re Leigh’s Will Trusts [1970] Ch 277

Josh Lewison
Radcliffe Chambers

3

That’s really helpful
thank you