23rd Field Reg. RCA, Sexton Question

[kevinT]

Or should I say a couple of questions.

Were 23rd Field equipped with Sextons from D-Day on or did they have the M7 Priest initially?
Would the troop markings for "A" troop, for example, have been AA, AB, AC, AD and "B" troop BA, BB....

Were the Ram OP's replaced by Sherman OP's or did it depend on what ever was available?

Thank you for any information.

Cheers
Kevin