... is there any proof of the drilled and grooved discs being better i know the pagid discs are vented so assume bout the same thing
Vented and grooved/cross drilled are designed to do different things.
Vented is designed to get more airflow through the disks and improve cooling. Often, fronts are vented and rears are plain, and you should not replace vented with plain, because you may not get enough cooling. With the lower amount of work that rears have to do, vented rears don't usually make a difference.
Grooved or cross drilled clean up the surface of the pads (and so avoid the problem that pads 'glaze', under some conditions, usually sustained light-ish braking - grooved probably fulfil this role better than cross drilled, depending on the groove design and the number of cross drillings) and they vent the pad surface (some pads can absorb a little water, and when this happens, under braking, the water can escape as steam, and, without some other way to escape, this stops the pads making full contact with the disks, and this 'I've just pressed the brakes and nothing has happened' effect can be quite disturbing, so it really is something that you don't want - on the other hand, if you have pads that don't absorb water, this isn't an issue).
On the other hand, either grooved or cross-drilled can create local weak spots in the disks, and they can crack under high thermal loading, so, if you go down either the grooved or cross-drilled routes, you want good quality disks.
... i seem to havto press the brake to slpw down but to stop havto floor the pedal and when braking on the motorway seem to get the steering wheel kicking...
Having to floor the pedal is a bad thing, but is probably either air in the system (or absorbed water in the fluid, but you'd expect that to only show up late in a heavy braking phase) or rubbers in the master cylinder being shot. Neither helped by changing the pads or disks, so it is well to know what problem/problems you are trying to cure.
When was the fluid last changed, and what has happened since? How old is the car?
Steering wheels kicking(/vibration) can be caused by disk corrosion, particularly around the edges, but there are probably other causes, too. (Such as 'disk warping' which isn't usually warping that can be measured with a run-out gauge.)