I am not an expert, however this should help.
First of all lets look at the principals required to cast:

1. Face your left foot in the direction of the cast, with your right foot in a comfortable position for balance. Twist your waist past your right foot as the more your body twists, the more power you will generate.
2. Extend your right arm so that the tip of the rod is far back therefore allowing you to load the rod more and generate more power.
3. Now its like a golf swing, Weight on the back foot, balanced on the left. Start moving your weight forward as you twist your body and cast. This action will provide more power.
4. Load the rod. You can either swing the rod in an arc from the desired end direction to behind you with the sinker loading the rod tip, or you can load the rod by swinging the sinker so that its beyond the rod tip and loading the tip as well.
5. The rod needs to be effectively loaded by beginning the cast slowly with a gradual acceleration until maximum speed is reached just prior to stopping the rod.
6. The sinker will now go in the direction of the rod tip just before it was stopped.
7. It is important that the rod tip is not lowered or raised again above the departure of the line from the rod tip.
8. The longer the rod and the longer the casting stroke, the more the rod can be loaded and the further you can cast.

Some important notes.

1. You will need to match your rod, reel and line weight. Check the guides normally printed on the rod and reel.
2. The terminal weight must also match the rod and line weight.
3. It will be a good idea to use a shock leader with at least a few turns on the spool. The greatest load is generated when the line starts leaving the spool.
4. Practice, practice. Find a field and practice on it.
5. Direction, accuracy and technique will come with practice.
6. Don't use brute force, rather be smooth. Start slowly and accelerate through the cast.

I have read with interest your tips on distance casting, however, I still have some questions.....trust you can assist with reel set-up.
We are using Daiwa Grandwave 40 and Saltist 50, on 14' sticks, BUT, not cracking the 120M mark.
The question...as far as the spool set-up goes, is it correct to use the 'end float' adjustment to limit the free running of the spool??.
Any other more detailed info on rod/reel set-up will be appreciated.
Thanks.

You dont mention the type of rods and weights being used. The Poseidon 5 14ft with the heavy tip and a 7 or 8oz sinker will give good results. You can adjust the end float adjustment, however your technique needs to be smooth and correct for the best results. If you are in the KZN area you could get lessons from Ivan Stopforth.

We are using a Penn Powerstick 14'//Grandwave 40 and a 'cheapie' Okuma 14'//Saltist 50.
With the Penn (my son), is getting 120m max with a 7 oz flat plug using the light tip...myself 90m max, also with 7oz!.
You say it is acceptable to adjust the spool end float...enough to cause a slowing of the free running action of the spool??.
We are Jhb based, but try to get to the South Coast as often as possible>>'Toti to Scottburgh.
Thanks so far.