Woodrow was conned by the keeper

[Whitesideup]

The laws state that once the ref has blown his whistle the GK is not allowed to be off his line nor move his feet until the kick is taken. These days there is hardly a legal penalty.

Law 14: The defending goalkeeper must remain on the goal line, facing the kicker, between the goalposts until the ball has been kicked.

I think this now means that the keeper can move his feet along the line, but not forward of the line. Grandad is still right as nearly every keeper makes a move forward .. simple maths tells you that narrows the angle. However the keeper standing on the left and moving into the middle in the latter stages of the run-up is now legal. This is a relatively recent change to the laws.

[cmg]

The laws state that once the ref has blown his whistle the GK is not allowed to be off his line nor move his feet until the kick is taken.

This is not quite right.
The Law (no. 14 "The defending goalkeeper must remain on the goal line, facing the kicker, between the goalposts until the ball has been kicked.") does not permit the keeper to move towards the ball, but he is at liberty to move along the goal line.

"Once the Referee signals for the penalty kick to commence, the goalkeeper may move from side to side along his goal line between the goal posts, but he may not move off the goal line (into the field or backward into the goal net area) until the ball has been kicked. It is irrelevant if one or both of the goalkeeper's feet are not physically touching the ground, so long as the goalkeeper has not moved forward or backward from the goal line itself. The goalkeeper must also be facing the kicker."
The Law restricting the sideways movement of the keeper was changed in 1997.