Thanks for your replies, it's reassuring to know that the mouth ulcers are connected to UC and my diagnosis isn't wrong. Google had me confused, some things saying it only affects your colon and with my GIs input I thought I may be the only one experiencing this.
Now I know that they are connected and it's not just a coincidence, I can start up with the enemas as soon as I feel a mouth ulcer coming on, hopefully this will help prevent things getting out of hand.
Thanks for your help