MP Expenses - James Arbuthnot

I have been looking at the records on the BBC website about MP expense claims.

As an IT professional I was interested to see that my MP, James Arbuthnot has been buying computing equipment and software on his expenses. He bought an IBM Thinkpad laptop for £2001.18, he then added a DVD drive and a spare battery for £350.22. This was in Feb 05. In May 04 he bought a memory stick for a whopping £322.26. In Dec 04 he bought wireless PC kit for £184.96 and in Jan 05 a service pack from IBM for £158.63 - this was before he bought the laptop though. In Jan 05 he also bought a scanner, wireless cards and a copy of Adobe Acrobat software. In Feb 05 he added a firewall and a router for £129.99 and £119.91. He seems to have trouble using this kit though as he has twice paid for out of hours IT support at his home to connect his wireless network.
In April 06 he bought another scanner for £559.30 to go with the one he bought in Feb 06 for £75.98 I assume.
He bought several USB memory sticks in 2005/06 - Feb 06 he bought 3 for just under £90, Sep 05 he bought another for £149.99 and Dec 05 he bought another for £59.99. In Sept 05 he bought a couple of external hard drives for over £300. It is a good job he is also claiming for his subscriptions to the Information Commissioner as a registered data user under the Data Protection Act as he seems to get through a load of USB Memory - maybe he leaves them in all the taxis he takes.
On the telecoms side he claims between £60 and £120 per month for his broadband (on a few occasions he pays for his calls - or half of them - but usually he doesn't split this out and claims for all the charges). He also claims for a separate fax line but this also appears to be included in his broadband bills too. I pay about £60 per quarter for my broadband, I share my fax line with the same line and I have a broadband phone service thrown in for free. So he seems to be being seriously ripped off.
He is also running BOTH a Blackberry Mobile Phone (which has Internet access built in) and paying for a Vodafone mobile with GPRS Internet on top. So he pays for using the Internet on his Vodafone mobile. I say "he pays" but of course he has re-charged both of them. Does he always carry both of them?
It occurs to me that the country could save a fortune if someone at the House of Commons arranged for MPs stationery, computer purchases and so on. How can the country provide security for PCs and networks used by MPs at home if they seem to be able to buy their own equipment out of the public purse?