I've had a customer at work tell me he thinks, himself, and a colleague had it in January after another colleague came back from Spain, all three suspect they had it.
A friend of many years told me at the end of May that he and his girl friend think they had it in December, his girlfriend works in a hospital as a manager for a group of doctors, the doctors have since told her they most likely had it as it's been in the UK for 6 - 8 months.
Some one else I know who's wife works in a care home think they had it in December, with six residents dying, staff ill, his wife had a bit of a cough, she thinks if it was the virus she may have passed something on to him as he had an odd chest for weeks and her sister was ill and had to go to hospital with pneumonia type illness in January.
Was it CV19 or something else, I guess we'll never know, but there's certainly no shortage of people that think they've possibly had it, and if it was about in November in China then it could have easily got back here in November/December.