I do not think the goalposts were moved. There were no goal posts. Immigration did not publish any guidance for extensions until almost 6 months after the visa was implemented. This was mentioned by the MFA in the FCCT interview ie Immigration were still working on guidelines. They can whinge about the actual goal posts but they have not moved
That is the first time I have heard an interview request in the UK. There are posts in here about interviews in Vietnam & Laos etc. They seem just to be quality checks and are fine.
Will be interesting to see if they can. They use the same branch as the others mentioned. All the agents used to be in the bank with their t-shirts on getting places in the queues as clients driven to the bank. Dozens of accounts must have been opened per day at high season a couple of years ago.