Formula to copy data based on criteria

My brain hurts this morning. I've been trawling the web and can't see a solution for a relatively simple criterion-based copy/paste. The spreadsheet shows clearly the source data, the criteria used and the desired end result.

In short, if I want to select data in cells in one column, if the values in another column meet a criterion and copy the selected values to another location.

Can you help me (again...)??