Thank you for your experience and advice. How did you word your disclosure? The messages about non-disclosure are confusing and I am wondering about staying quiet especially as so many advise non-disclosure. I will also consider applying for a year long visa so thank you for that advice.
I kept it short and simple. Part of my thinking was as I was attendeding in person at the visa centre I was willing to explain it further if need be, I put something like "2005 conviction for possession of indecent images of children". I was in 2 minds about
disclosing like you but I ended up deciding I didnt fancy being stopped in Shanghai airport and risk being sent back, which may have attracted publicity in UK, and on the other hand if my visa got refused it wasnt the end of the world if I couldnt go to China again