@daylightfading there are no tests that need to be done before 12 weeks so don't worry about that and, in my experience, not that much has changed since the virus. It was very, very slow anyway (I say that as a 37 year old, FTM classed as high risk who is now 32 weeks pregnant so my early appointments were unaffected by covid)
The booking in appointment is normally done between 8 and 10 weeks. It's basically an hour or so of answering questions about your health, family history, medical issues, past pregnancies etc and it is at this appointment that they decide of you are to remain under midwife care (low risk) or of you will be consultant led (high risk). This used to be f2f but is now either a telephone appt or combined with your dating scan appt...it really doesn't make much difference.
The bloods they take at this stage are not time critical. They just check your blood type and test for things like hepatitis and hiv etc so no difference between doing them at 8, 10 or 12 weeks.
The bloods that are time critical are the ones for the combined screening test which need to be done before 14 weeks. These get done at the same time as your dating scan which is still going ahead as normal as it's an 'essential appointment' so, again,no need to worry about that.
As mentioned before, my first proper midwife appt was at 16 weeks and it was nice to meet her and see someone f2f but I wouldn't describe it as essential so I understand why they've made that one a telephone appt too, although yours isn't for another 3 months so everything could change by then.
If you are classed as high risk at your initial booking appt then you will also have consultant appts which run concurrently to the midwife appts. Some of mine have been by phone, some have been f2f. I think my first was at 15 weeks then the next at 28 weeks so a big gap even before covid.
Early pregnancy is a very slow time, with or without coronavirus. You should still have contact numbers for midwives, details for the EPU, your GP and A&E though which are all available if you need them. If all is fine though, it'll be a slow start so make sure you manage your expectations from the get go.