As I recall, the early models of V2 had a radio command fuel shut off, which was used to set the range. The outgoing missile was tracked by ground radar and the shutoff signal sent when the missile reached the required velocity. Later models were fitted with an integrating accelerometer which did this automatically.
The missile was launched vertically and was set for direction by using the gyro compass to rotate the missile to the required bearing. A clockwork mechanism then tipped the missile over to a set angle at that bearing after the initial launch phase using the fin tabs.
Radio tracking beacons were fitted to occasional V1 and V2 to enable impact tracking, but had nothing directly to do with the guidance. Both missiles were essentially autonomous and would not have been affected by jamming.
Even if we had managed to develop a heat seeking missile at that point in the war, a V2 would have been an extremely difficult target to hit as the rockets only fired for a short time on take off!