Thanks all for their replies, manages to get hold of urology nurse for advice.
He thinks that another dilation may be required, told to persevere at the moment as he would be more concered if the catheter was not going in.
As far as twisting it goes it seems to work.
Will see how it goes over the next couple of weeks before going to GP.
There's no need to panic just now although getting a catheter in place again for another week doesn't appeal to me. No change of catheter or diet.
Thanks again gents.
Cheers.