Revocation of benefit during notice period

[option click]

I am shortly due to go on paternity leave. I have negotiated full paid leave, rather than the statutory offering. This was at the company's discretion and they are by no means contractually obliged to offer this payment.

If I were to hand my notice in, would the company be within their rights to withdraw this offer or would they be obliged to honour it? I have prior confirmation in writing from HRManagement, but given that it's not an 'official' benefit, would it depend more on goodwill?

[Kermit power]

So, they've offered you an enhanced benefit, which they didn't have to offer you, so that you can take time out for paternity leave.

Now you're planning to leave anyway, and you still want to take advantage of their generosity? Do you have any integrity?