It's a variable lag. For small data sets, such as those now being examined, a fix lag is made to best match the event the event that is being examined.

It was my intention to find an explanation for something out of the ordinary in the weekly deaths that has been occurring recently. I was doing that without reference to an overlay of cases using a fixed lag.

It was you who chose a fixed lag to show a correlation between cases and deaths as an explanation. I was demonstrating that choosing an arbitrary fixed lag does not match everywhere. You also chose to match the most recent peak. This adds some further bias. Rather than examine this event, it tends to obscure it while replacing it with an issue over an earlier time period.

If one is not careful, the next step could be to use a variable lag to make cases and deaths appear to tie up perfectly everywhere. And on what evidence would that be based? This all goes to show how dodgy mass PCR test results can make a mockery of analysing both cases and deaths - and the relationship between them. This is why I prefer to use total deaths and comparisons with previous years.

"A Department of Health spokesman said: “We are confident the death statistics are robust...". Lies, damned lies and statistics prevail. Government likes the unprecedented control it now has and will "manage" the data to keep that control. They are dancing to the tune of the globalists in most, if not all, matters. The climate change scam is another example based on flawed and manipulated data and the indoctrination of those in education.

Also worth bearing in mind potential impact of antibody-inducing vaccines on people with dysfunctional immune systems. See
https://www.bmj.com/content/370/bmj.m2722/rr-5
For very ill elderly people there's no easy solution. For younger people we should be doing more to help repair their immune system and metabolic health IMHO. Eg see promising new developments to allow people to check their blood glucose and insulin levels at home and adjust their diet to reduce diabetes. Eg https://www.dietdoctor.com/low-carb/doctor/donal-collins

Metabolic health is simple enough.

Get off your arse, do some exercise and stop living on takeaways.

The UK population as a whole generally has awful metabolic health. Addressing that would save countless lives and hospital pressures from pretty much everything from covid to cancer to cardiac.