Slouching it was me that mentioned itchy nipples a while back (although someone else may have done so more recently). I've been moisturising them daily with E45 lotion which has helped a bit, but now my whole skin is like a desert so I've got some E45 emollient bath oil which I intend to have a good soak in this evening.
Cheese re. telling work I was really worried, and took the cop-out route in the end and did it in an email to my manager and her boss. As it happened I was really p'd off with them about something else at the time, so it seemed appropriate to keep the tone very formal, and I admit it was a bit of a two fingers up "well I'm outa here soon" kind of thing. I just basically stated the facts and asked that they keep it to themselves until after my scan. As it turned out they were as nice as I could have expected about it, although we've only talked about it terms of practicalities for work, neither being the congratulatory type. I'm actually looking forward to telling everyone else, all being well at the end of next week - hopefully there will be great excitement as despite being an all female team there hasn't been a pregnancy for a good 5 years.
Re NCT classes I am seriously thinking of doing them, especially after the good feedback several of you ladies have given. I don't have any local friends (nearest is a 20 min drive away) and am really worried about feeling isolated after the baby is born and DH goes back to work. I also think I would benefit from that sort of group learning situation and feel pretty clueless, not to mention a little bit scared as a first timer. I may try the NHS ones too, but assuming they will be held at the hospital where I am booked to give birth, this may not be so good on the making local friends front as it's half an hour away and in a different county.
Hope everyone's had a good day. I managed to wangle working from home, which is always a bonus on a Friday! 
Oh and a little tip for those who like to get creative in the kitchen - DH just informed me that on the BBC Good Food website they have a link to "pregnancy friendly" recipes - excellent idea!