The UK government has announced changes to pre-departure testing from 4am, Tuesday 7th December 2021. From this time all people aged 12 years and over must take a PCR or LFD COVID-19 test before they travel to England from abroad.
You must take the test in the 2 days before your service to England departs. If your journey to England is a multi-leg journey, you must take the test in the 2 days before the start of the first leg.
This will apply whether you qualify as fully vaccinated or not. This test will need to be followed by Day 2 PCR test upon arrival.
Please see more details on the gov website here.