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At the moment its difficult enough to do other currencies such as $ or €, but I will be looking into it. Bitcoin however might be even more difficult since I don't think the Bank of English will publish accepted conversion rates. So that's a barrier to my accepting bitcoins at the moment, unless yourself or anyone els win the community knows how to address that?
You can get price information at a given date by using the "custom date" filter on their charts pages, i.e. http://bitcoincharts.com/charts/mtgoxGBP#rg60zigHourlyzczsg2013-03-19zeg2013-03-22ztgSzm1g10zm2g25zxzvzl
Note you can get that price data in table format by clicking the "Load raw data" link below the chart.
(or use the json link that this is fed from, if you wish to automate that - http://bitcoincharts.com/charts/chart.json?m=mtgoxGBP&SubmitButton=Draw&r=60&i=Hourly&c=1&s=2013-03-19&e=2013-03-22&Prev=&Next=&t=S&b=&a1=&m1=10&a2=&m2=25&x=1&i1=&i2=&i3=&i4=&v=1&cv=0&ps=0&l=1&p=0& ).