At the risk of stating the obvious, the type of hall is "Mission", and it is "they're" not "there", but the lyrics in the DT are a bit of a mess, so here's my tidy up.
MRS. ADLAM'S ANGELS (Ralph McTell)
Sundays as a rule, us kids went to Sunday school And Mrs. Adlam's said, angels stood by our bed To keep us safe from dark, right through 'til days begun We used to to lie awake, just to try and see one And though we never saw one anywhere We heard them softly sing in the air
Sundays occasionally, we were invited back for tea And bread with jam and cream, made Sundays seem a dream And in the dim Mission Hall, Mrs. Adlam playing With Mrs. Adlam's angels everywhere And we thought we saw a halo in her hair
Sundays for sure, aren't like that any more It's getting hard for me, to see her face in front of me I wonder if her angels have their arms around her curled They're keeping her safe from harm, Protecting her from the world On a summer Sunday evening, do I dare Hear Mrs. Adlam's angels in the air?
I think the above is pretty much correct, but McTell's diction is not always that distinct.