Thanks @bloodywhitecat. His consultant appointment letter did mention that he could bring someone with him but he's adamant he doesn't me to go. I think this is mainly because he knows that we would need to find someone to have the kids, and then we'd either have to tell them or tell a convoluted lie. I'm hoping today's news will help to focus him/us on how we can manage the whole thing from a practical point of view. How are things with your DH? Hope you're OK?
@stairway - that's very reassuring, thank you. Go your Gran!
@Silkiechickscat - you're absolutely right... I think telling people makes it all the more real. He's also really worried about upsetting people, especially his mum. And I think he wants to minimise the upset and worry until he has all of the information about what it is exactly he is facing, and what this means in terms of treatment and prognosis. I totally understand this - I'd feel the same. It's just the practical problems of dealing with appointments/operations etc without telling anyone, but also needing them to watch the kids for a bit. He's even talking about getting a taxi to/from the hospital when he has his operation, which I think is ridiculous... again, today's results might help him to come to terms with the fact that he has to start telling people sooner rather than later.
@Whydoesthisneedtobe - our situations are scarily similar... my DP had various tests that didn't show anything up, so he almost cancelled the cystoscopy (he was dreading it, and didn't think there was any point). We're both so pleased he didn't now. His TURBT is booked for the beginning of March - I think they remove the tumour, which then goes for biopsy testing to determine the stage/grade of cancer, and he has a chemotherapy drug put into his bladder at this point as an initial treatment. Depending on the biopsy results, they then decide on the best course of treatment. He needs to self-isolate for two weeks from next Tuesday. I know exactly what you mean about worrying how to act and be normal around people that don't know - I felt exactly the same when we first heard the news. His mum rang me yesterday about something and I nearly ignored her call because I panicked she'd ask me if he was OK! My DP is the same about not telling anyone until we have more concrete news... I totally understand, but it does seem to make it feel harder.
It might seem impossible right now, but, if you're like me (I mean, you ARE me 2 weeks ago, aren't you?!), you might find that, in a few days, you might find that you feel more able to cope and face things - I did. It's such a shock at first, and it seems like it would be impossible to get on with normal life, but you somehow do, and you somehow don't feel quite so scared and unable to cope. So, you might find that you feel like you can give the interview a go, and it might prove a healthy distraction. Keep in touch and let me know how you're getting on. 
The consultant appointment has been brought forward today (I'm guessing because of the snow) - I was supposed to be at work but I'm not (because snow), which is lucky. I'll update later once we've heard the results.
Thanks everyone.