No You are not required if you have NO income from anywhere. See information below for determining if you meet the Gross Income Test.
Your income, filing status, and age generally determine whether you must file a return. Generally, you must file a return if your gross income from worldwide sources is at least the amount shown for your filing status in the Filing Requirements table in Chapter 1 of Publication 54, Tax Guide for U.S. Citizens and Resident Aliens Abroad.
Gross income includes all income you receive in the form of money, goods, property, and services that is not exempt from tax. In determining whether you must file a return, you must consider as gross income any income that you exclude as foreign earned income or as a foreign housing amount. If you are self-employed, your gross income includes the amount on the Gross Income line of Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship).
If you are an American expat living in or arriving to the UK, you will need to file your US taxes. This goes for any US citizen, dual national or Green Card Holder in the UK, even if you are no longer earning US income. Just because you are not earning income in the US, your US tax filing requirements do not stop.
Use the link below for additional information on filing US
US Citizens Living Abroad Filing Requirements-IRS
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