A short while back the BBC added a batch of new/never before seen scripts to their Doctor Who database, including the 60th specials. Tucked away at the tail end of "The giggle" is an alternate ending scene featuring Wilfred Mott that the late Bernard Cribbins didn't shoot before his demise:

THE DOCTOR And Grandad, where is he?

SYLVIA He’s off, shooting moles.

From offstage, a BANG!

SYLVIA (CONT’D) There he goes.

And all TURN to look.

There’s WILF, in his WHEELCHAIR, buzzing across the lawn, with a SHOTGUN.

WILF I’ll get ‘em! Don’t you worry, Doctor! You stay there! I’ll get the little..!

ALL laughing, except Rose.

ROSE Leave them alone!

WILF I will never surrender!

And Wilf glides away. All turn back to each other.

THE DOCTOR Don’t worry, I gave the moles a forcefield. Love the moles.

Here's to things left undone, Mr Cribbins. You live on in our hearts.