Elaine
I have a permanent catheter and frequently get the feeling I want to urinate. The position of the catheter will affect the feeling of wanting to urinate. If the catheter is high up in the bladder urine will build up below the oulet in the catheter. A small build up of debris in the catheter can also halt the flow for a while. Pressure in the bladder will usually push the debris out. As long as the bag is filling there should be nothing to worry about. I find lying down will sometimes help restart the flow.
I was told Rosé colour urine was okay Red wine colour needs attention. As already said a bit of bypassing frequently happens, if you get bright red clots coming passed the catheter get help.
I am sure it has probably been mentioned but a small squirt of instilagel or hydrocaine down the eye of the penis at the side of the catheter will usually ease any discomfort. It costs £2-3 and can be issued by a pharmacist without prescription, someone did say Boots won't issue it without a prescription.
As always if in doubt get medical attention.
Tell him to take it easy but keep mobile.
Thanks Chris