Using emergency US passport to leave/enter UK while UKBA is reviewing my visa [closed]

I am a US expat living in the UK. I am currently renewing my UK visa, but I need to travel during the process. The US London Embassy says

If your current U.S. passport is being held by the UK Border Agency or a foreign Embassy for visa processing and you have urgent need of travel, you can apply for an emergency temporary passport. ... As the temporary passport will not have any UK visas, you must contact the UK Border Agency (UKBA) to find out if you can depart the United Kingdom whilst the visa application is being processed without forfeiting the application and, if so, what documentation you need to take with you to legally return to the United Kingdom.

As the UKBA does not provide a free way to find out this information, I was hoping someone might know if it is possible to depart/re-enter the UK on an emergency US passport without forfeiting my current application.

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Can I travel to the UK while my visa is being processed?

Because your pending immigration application will be treated as withdrawn, you will be refused entry to the UK unless you are allowed to re-enter the UK with a different type of leave (i.e. because you have made another immigration application before returning to the UK) or your existing leave has not yet expired and ...

Can I stay in UK while waiting for my visa?

The waiting time ends for all applications when you get a letter or an email with a decision. You can stay in the UK until you've been given a decision, as long as you applied before your last visa expired.

Can you get an emergency UK visa?

You can apply for an emergency travel document and book an appointment for someone else if they're a British citizen or British national (overseas). They might have to attend an appointment and they must collect their emergency travel document in person.

Can I travel to UK with visa on old passport?

Prove your right to work in the UKYou cannot use a valid visa in your expired passport to prove you have the right to work in the UK. You must replace your visa with a biometric residence permit.

Britons still with red passports told to check before leaving UK or you may be caught out | bre...

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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