NB since my original post, this server has increased on price from £200.09 to £202.20 delivered. Still stupidly cheap though! Now back to the original post...
The cheapest way to get this server so far. Ridiculous price for this server. I have confirmed that buy-hp are the correct type of HP Partner for the cashback to work.
The price above includes the £6.50 next day delivery.
You need to have an invoice dated before 31 August for the cashback to work. I've been told by buy-hp that they have stock.
I've just checked on the live chat thingy on the hp.buy.com site and have been told that the important bit is the invoice date - so as long as you get your order in for Friday (31st), you'll get the right invoice date to make the claim to HP for your cashback.
You can email the cashback form and your invoice instead of sending it by snail. The email address for this is [email protected]
To make things easier, here is the owners' thread!