一般是因为目前放出位置有限，实时多关注下预约界面，勤刷新。
The IDV app lets you send information to UKVI without having to book a UKVCAS appointment. The IDV app verifies your identity and submits documents directly to…
UKVCAS appointment: within 5 working daysUKVCAS appointment: next working dayID app: within 5 working days Application to settle on the basis of UK Ancestry (through form SET(O)) No Yes No Application to settle as a former member of HM Forces (through form SET(AF)) No Yes No ...