Because it will actually make things a bit more sensable. If you imagine someone who has physical health issues, as it stands it can be a bit of an odd mix between the NHS trust, the local authority and the housing authority. Then things like say Winter Fuel come in to the mix, the idea of having a seperate agency with each one not knowing about the other makes little sense.
The issue is the government and civil service would charge billions of pounds to arrange a piss up in a brewery, big contracts would have to go out to tender and only after both Logica and Accenture had billed for a few hundread million just to suggest that the brewery venue is suitable. After a bit of fighting between the politicions about which of their marginal constituancies is more worthy of the investment, they would finally decide that the pissup should happen in a new, purpose built facility in the middle of effin no where, building a new motorway to connect it. Finally the day before the party (which has now been pushed back 3 years) they would realise that due to a lack of any rail or public transport links, and the fact the newly constructed brewery is 50 miles away from the nearest hotel, lots of people might be drunk driving. As such re-enforcements from the met police would be drafted in to brethalise and esnure responsible drinking at the piss up. In the end 5 people would turn up as the politicions call it a resounding sucsess and declare the the legacy of rejuvination would live on. The brewery, obviously not an economically viable concern given its location and lack of key construction features such as a mash tub, closes as soon as the increased subsidy that was needed expires.
Anyone who in any way criticsed the piss up is branded un-patrotic, a spoil sport, and worst of all is accused of squeezing the economy by not increasing spending.