Cant you set it to offline mode, switch phone off. Insert your dutch sim, phone on, stay in offline mode, wait for it to boot. Connect to PC Suite, change to general profile, and then run NSS and NSU?
Oh hang on, after re-reading that, I think you mean 'Unlock', and not 'Debrand', in which case no you will need to wait until you get back to the UK. Unless you can find on unlocking shop in the Netherlands with
N95 capabilites....
