Can I go back to my 2nd-year placement for later APPEL placements if I get on well there?

You are allowed to undertake your 4th-year or 5th-year placement (but not both) in the same pharmacy where you attended the 2nd-year placement.  However, APPEL cannot guarantee that such an arrangement can be made.  You may engage in part-time, holiday and/or summer work experience with the 2nd-year Training Establishment, but such arrangements are between you and the Training Establishment.