Hey guys (and girls)
Here is an update on all of this.
Firstly i got a valve (balanced) from Phill at divingniknaks, it will be fitted to my suit when i start diving again this season.
For all of this to work a couple of modifications have to be made.
You need to remove the standard barbed plastic end of the tube, this can be done easily by heating the rubber pipe in hot water and simply pulling hard. You then need to replace this with a new valve. Most guys do this and replace it with a quick connect valve. The problem with these is that they do not have an internal valve in them so you will "leak" when its not plugged in.
If you follow the link posted by Daz above, the company are hugely helpful and very quick to post the valves.
Once you have your valve, simply push it into the end of the pee valve tube as shown below....
As you can see, the valve comes in two bits...
Here i have opened a catheter to show you how it all connects together. This can now (obviously) not be used as it needs to be sterile.
Catheter connected to valve...
As for the full process.....well. Its not rocket science, but you do need to be extra careful with how clean everything is. I would recommend getting some antibacterial cleaner for your hands and downstairs. A bladder infection would not be nice. Unisept solution was recommended to me by an A&E nurse.
Once the catheter is in place you will know as wee will begin to flow from it. You need to inflate the baloon with the sterile water that comes with the catheter, and you will know if its not right as it hurts so go slowly. Dont use saline as the salt can crystalise out and make removing the balloon painful.
Catheters can be purchased online but are expensive. A chat with your doctor and explaining the whole situation means you can get them on prescription in the UK. It is probably a very good idea to be shown how to insert them properly too. As with all things, there is a certain point where reading abotu stuff on the internet is simply not enough
Make sure you keep a syringe handy for emptying the balloon, and dont panic if you connect it up, pull the plunger and nothing happens - it can take a few seconds for the balloon to deflate and the liquid to enter the syringe.