Vote David Cameron then! He's the one pushing through routine (reliable) testing on the NHS.
Glad you are using the private test - I was the person who suggested to group b strep support that we should introduce it here in the UK - albeit privately.
If you care about it, please join the Group B Strep Support charity - it's around £20 a year.
In terms of Hospital Policy - there are some NICE guidelines that all should use but, having atttended at a committee meeting that involved all areas of maternity care (GPs through to SHOs), we know this is not the case and GBS policies and procedures vary from hospital to hospital.
Personally, having met many Mums whose babies have died or been seriously disabled by GBS, I would have the antibiotics as, if there is an anaphylatic reaction at least you're in the right place for immediate treatment. Whilst there is no current research projects on anaphylatic reaction to antibiotics, I did read somewhere that 1 GP will see such a case every 10 years, albeit based on very old data.
This is what makes me so annoyed with the government, in rejecting the routine testing, they are using anaphylatic reaction as an excuse yet they have no hard evidence from current research to support this. ARGHH 
The even said that they have compared neo-natal death rates of USA which has routine GBS testing with the UK and the rates are the same. When we asked if this was neo-natal death rates from GBS they said no - it's just the total.