Morris Minor Owners Club

How do I apply for heritage cert

Hi all
I have just acquired a low light to collection
A 2 door 1957
A 4 door 1957
And now a low light convertable
The details of this car are
NMP. T10429/39 Z10429/30
SMM/63368
Engine. 64020
Type. MNR/SYN
BMT. 4299
Can anyone date and details of this car would appreciate
Cheers to all
Robert