UK Treasury bills are issued every week at a different yield. The yield is determined by market conditions and demand, and the Bank of England base rate.
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Before the UK Treasury Bills are issued, the yield is uncertain.
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The app will show you the yield that was achieved in the previous week. Therefore, the yield you receive on your UK Treasury bills may be different from that displayed at the time you place your order.
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This means that you will not know exactly what yield you will receive until after you have made your investment and committed your money for a month**.
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Once a UK Treasury bill is issued, the yield on that UK Treasury bill is fixed for around a month, typically 28 days.