Group 6 is being done concurrently to the age groups.
Group 6 offered via GP surgeries at local hubs, is one stream.
At the same time, age groups 5 then 7 (which is what they are now on) and then 8, are can book via the national booking system or wait until they have their letter.
Group 6 is far bigger than the age categories and so it will still be running whilst group 7 are done. Some will have been done concurrently to group 5, some concurrently to group 7 and possibly some concurrently with group 8.
But all of this is shot time frames. Group 7 are invited now and by the end of the week group 8 will probably be able to book. Group 6 will be finished soon.
Many areas will be onto group 9 and then 10 by the end of the month. It really is very fast.
Group 6 shouldn't feel they are left behind. It's just such a big age group and hard to administer that it takes a while. But most people who haven't heard yet, will hear in the next week or so.