Marsha we have been advised to plan for a return in June, who exactly is confirming to you that schools will be closed to Sep? Or is it just rumour.
Wuhan's timeline is below. It is hard to see given it was the epicentre of the coronavirus outbreak why the UK would diverge so far from their timeline. You can see it was just a few months in the end.
Lockdown timeline for Wuhan
13 February 2020, the Chinese government has issued extension of order to shut down all non-essential companies, including manufacturing plants, in Hubei Province until at least 24:00 20 February.[19]
20 February 2020, the Chinese government has issued extension of order to shut down all non-essential companies, including manufacturing plants, and all schools in Hubei Province until at least 24:00 10 March.[20]
13 March 2020: Huangshi removes controls and permits on road traffic within its urban area;[6] Qianjiang does the same for its entire administrative area.[7]
14 March 2020: Hubei Sanitation and Health Committee (卫生健康委员会) Vice-Chairperson Liu Dongru (柳东如) announces that only Wuhan remains a "high-risk area",[21] and that the entirety of the rest of the province is considered medium- or "low-risk areas". Any low-risk township-level divisions, in addition to those medium- and high-risk divisions with no confirmed active cases, could lift their blockades and other mobility controls.[22] Per China News Service reporting, by 14 March, besides the aforementioned Huangshi and Qianjiang, Yichang, Huanggang, Suizhou, Xiantao, Jingzhou, Jingmen, Shiyan, Xiangyang, Tianmen and Shennongjia had announced "measures to lessen controls" and for industries to incrementally resume work and production.[22]
17 March 2020: Jingzhou removes its permit requirements for transport, resuming normal transport operations, and also removes entry/exit controls on xiaoqu.[23]
18 March 2020: The Hubei taskforce to control COVID-19 (湖北省新冠肺炎疫情防控指挥部) announces that, with the exception of exit/entry into Wuhan and the province as a whole, all anti-COVID-19 traffic checkpoints within the province are to be removed.[24]
22 March 2020: Wuhan loosens its two-month lockdown.[25]
25 March 2020: Hubei lifts the lockdown outside of Wuhan,[26] although people will still need to confirm their "Green Code" health classification, designated by Alipay's monitoring system,[26] to travel.[27]
27 March 2020: Wuhan lifts its lockdown, resumes all transportation,[28] with residents intending to leave the city facing similar "Green Code" requirements as those in the rest of the province.[27]