Anyone been asked to take part in a research survey?

[JellyTots2009]

Received a pack today in the post with 'On Her Majesty's Service' printed at the top of envelope.

Inside it was a pack asking anyone over 2 years old in my household if they want to take part in a research study/survey where you do weekly tests for a month then once a month for 11 months.

It doesn't matter if you have had covid or not or if you have had your jabs or not. All can register to take part.

A person will come to deliver a swab and collect it once you are done.
You will be compensated with vouchers for completing each 'visit' by emails or post.

It did say in the pack we were randomly picked from a database so I was wondering if anyone else has received these packs? At first I thought it was a pack everyone received because it's addressed to 'the Occupier' but no you are selected.

My household are going to take part. We all do weekly tests for our job so might as well have a few benefits to go with it

Anyone else be joining?

I get two results, negative so far for covid antibodies and since 2nd vax positive for spike (vax) antibodies.

So it's been a good few weeks since I posted this.
We have completed our first months weekly visits.
However, I did need to ask the people who have also done this study if this has happened to you.

We received our vouchers through the post, mine and my partners came through together but my sons was missing. When the next set of vouchers came my sons was missing again so I did ring up and they said ' a box wasn't ticked but it was all done now so should be fine.'

Around a week or so later he received £150 voucher which I was surprised about, then today he received another £150.

Baring in mind we have only completed 5 visits so far. So have people been getting vouchers before they complete more tests? Or is this an error?