which store are u trying at
the regent st store is superb.. but manic.. they told me they have shipments every morning pretty much, and to come in early to collect an IP4 (don't think u can reserve these)
ps make sure u bring ID, as they may need to validate u're from uk - well thats what they did to my old flat mate - since they want to limit the number of these units then being re-sold in the middle east/asia