Speaking entirely for myself, I cannot imagine any possible valid reason, even without autothrottle, for having both hands on the column in the flare.
To control bounce or overflared landing, you need to apply power to arrest the descent. If going around, you need to press the TO/GA button and advance power (or follow the levers up) as you rotate to GA attitude.
In first generation jet aircraft (or old turboprops) there was generally another crew member available on the flight deck. Since I've never flown a Britannia or a Comet, I can't say if the FE retarded the power for you in the flare. Even if he did, I can't imagine the extent of the problems with co-ordination.
No - at low altitudes and particularly in the flare, one hand on the column, one on the thrust levers. If you have it trimmed out properly, it's no problem controlling the stick forces. Furthermore, having two hands on the column does not help. You don't "feel" the amount of deflection required. You use all the visual clues available to you, adjust as required and hold it. Adjust a little more if required, and hold it. You don't "feel" for the ground, or the crosswind.
As Intruder states, it is generally very important not to get a "greaser". In most aircraft ensuring good contact with the runway is far, far more important. In a B757, the difference in deck angle between a "greaser" and a tailstrike is only 0.5 degrees.
Hope this helps you in your studies.