It appears that residents in the 70-74 age bracket may now be able to book vaccination appointments via the NHS booking website. Presumably letters from the NHS inviting booking may now have been issued but some local mail deliveries appear disrupted, possibly due to the Covid outbreak at Coulsdon sorting office.
So it may be worth trying to book in advance of the letter at:
You will need to enter your NHS number and date of birth to access. During periods of high demand, the slot you have booked may be taken by someone else by the time you complete the booking process, so multiple attempts may be required.
If you are not yet eligible you will see a blocking message.
Many residents in Chipstead have been invited via the GP Hub process, which appears to operate in parallel with the above, contact being made by your local GP using voice or text message on a mobile phone.