Likewise, when we were using them daily collect and receive multiple items, you can slip in the odd one or two. Wouldnt ring up specifically. The way round it is, to your knowledge its a business address, i know many that work from home throughout the UK.
Packaging, think how it is going to be handled and pack accordingly. Address highly visible in black ink marker for larger items, smaller i used to print off on A4 and stick it to the parcel they call a carton.
Oops they are collecting tomorrow expensive item one carton to Wootton under edge, is it ok there?