I hope this is allowed but I've just seen this plea on FB for bonding squares for Hull Royal neonatal unit and thought of GN
www.facebook.com/hollie.phillips?__tn__=%2CdCH-R-R&eid=ARCccCR30k7bSMlK1xEW4_0RoOoFq8e1AW8Qf2xvscj87rC3OFFPXEWElgwkFNZt2L3Is7MxjeXgJIz_&hc_ref=ARQLKG_fw0PKQZTmWEfRIsU3K1gNETunB-vLGEPy_w7991wrs4Xxqg5HRQVgkAwWCj4&fref=nf
Hope the link works but I think if you copy and paste the above it will take you to the page and the instructions.
Being quizzed by chemist's assistant in Boots.