What I want is a button in Excel what takes two cell
values an inserts them in a web address and calls it in a
browser. For example:

Cell A1 = 526440
Cell B1 = 182376

Press button, internet opens with following address:
http://www.streetmap.co.uk/newmap.srf?
x=526440&y=182376&z=0&sv=526440,182376&st=4&mapp=n ewmap.srf
&searchp=newsearch.srf

This solution would go out to around 50 different
organisations, so the method used to call the internet
should be pretty common.

Thanks!