As GeoffHa wrote, we need a picture. Make it a scan, preferably magnified.
The 2 1/2d carmine Wilding stamp comes in two types. The best way to check is the upper line of the central cross of the diadem the Queen is wearing. It stops halfway the cross on one type and extends the full length of the cross on the other.
This, however, does not answer the question whether it is the booklet stamp. Do you want to know whether the stamp is from a booklet, or whether it is of a certain type (booklets, mostly have type 2).
If you want to be sure it is a booklet stamp, we shall need to know what watermark the stamp has and we need a clear scan of the perforations -unless your stamp has a margin attached. Booklet panes were printed in sheets and cut up during the production of the booklet. Consequently, most of these stamps have at least one side with straight-cut perforation tips. Stamps from coils often have two opposing sides with straight-cut perforation tips; that you will not find from booklets. Stamps from counter sheets have been torn off and will not show straight-cut perforation tips. Almost all types found in booklets, also were issued from counter sheets.
Of course, this all assumes the clerk at the post office did not use scissors to separate single stamps from counter sheets.