Check flag for GP--seems redundant

[karen-hotopp]

          Yes, I think you've done this correctly. Nicely automated!

Not sure what that line does, actually... since the dates are NA, they shouldn't be able to be > or < a date. Will investigate (may be an artifact from SPSS?).

Originally posted by @karen-hotopp in #103 (comment)

[karen-hotopp]

91_2_coverage_gp_practice.R
line 164
`## AMc question:

also, what does the { is.na(valid_from) & is.na(valid_to) > dmy("01-04-2022") } do?

I think this date relates to the 2021/22 FY run`