Yes, hot water crust is suitable for freezing. However, I do not recommend freezing the uncooked pies filled with meat, as this can cause contamination. Instead, freeze the dough by itself and only fill once thawed. To freeze hot water crust, wrap it in a few layers of plastic film, then one layer of aluminium film. Ideally also place it in an airtight container, as this will protect against freezer burn.