UK, Ireland / Posting mail from Poland to the UK [26]

Hello I'm after some help please, I dont speak polish but I am expecting a package from poland to the UK. It was posted on the Tuesday the 26th of april (which was 6 days ago) and I'm wondering when it will arrive.

I have a tracking number of RR383862976PL, I have treid the royal mail website and it says "There is no data currently available for this tracking reference. Please try again later"

Bearing in mind that Friday the 29th April till Monday the 2nd of may is a UK bank holiday so theise 4 days wont count. Generally how long does items from poland to the UK take

Also I cant seem to find the polish post office website, Could some one please track it for me on the polish website and see what it says,

Tracking number:RR383862976PL

thanks :D