This number calls me day after day after day... Always engaged when I return the call though.

Any idea how I can find out who it belongs to?

What happens when you answer it?

Rarely answer the land line, it causes the broadband to fail. When I have done it's always silent.

Regularily get calls from a range of 46** so farely sure it is a commercial number.

i did search on ukphoneinfo.com and hear that come up
here