The song is in Bb (well, almost--the recording is a little out of tune).
Sounds to me like the guitar is capoed at the 3rd fret and playing in C.
G F C G
G F
Lovely Rita meter maid
C G
Lovely Rita meter maid
C Bb F C G
Lovely Rita meter maid nothing can come between us
Am D G
When it gets dark I tow your heart away
C F Bb Eb
Standing by a parking meter when I caught a glimpse of Rita
C G
Filling in a ticket in her little white book.
C F Bb Eb
In a cap she looked much older, and the bag across her shoulder
C G C Am Dm G
Made her look a little like a military man
C Bb F C G
Lovely Rita meter maid may I enquire discreetly
Am D G F/G Em/G Dm
When are you free to take some tea with me?
C/G G
(Ah) Rita!
piano solo
C Bb F C G
Am D G
C F Bb Eb
Took her out and tried to win her, had a laugh, and over dinner
C G
Told her I would really like to see her again
C F Bb Eb
Got the bill and Rita paid it, took her home, I nearly made it,
C G C Am Dm G
Sitting on the sofa with a sister or two
C Bb F C G
Oh, lovely Rita, meter maid, where would I be without you?
Am D G
Give us a wink and make me think of you!
G F
Lovely Rita meter maid
C G
Lovely Rita meter maid
G F
Lovely Rita meter maid
C G
Lovely Rita meter maid