If i were you I would hang on for a bit. Administration means the company is still trading (for the moment) and in any event even if it all comes tumbling down they may well try to honour existing orders. The site is still up and accepting orders. If you paid by credit card you will get your money back from the card company anyway if necessary.
I have been anxiously scouring the web for an alternative if AR gives up the ghost entirely. I need classic suits for work, and Hobbs et al are often too feminine/narrow cut etc for my tastes.