“…Worldwide historical data shows a high incidence of maternal and fetal complications (Al-Suleiman et al, 1991;Smith et al, 1996;Barfield et al, 2010;Sun et al, 2001;Serjeant et al, 2004Serjeant et al, , 2005Rajab et al, 2006;Chakravarty et al, 2008;Villers et al, 2008;Afolabi et al, 2009;Al Jama et al, 2009;Asnani et al, 2011;Wilson et al, 2012;Al-Farsi et al, 2013), but most studies are single-centred and retrospective in nature and involve small numbers of respondents. There are four publications from the UK, two of which are surveys based on data over 18 years old and, in view of changes in management over this time, are unlikely to reflect current practice and outcomes (Tuck et al, 1983;Howard et al, 1995). The most recent studies from the UK are from single or small numbers of specialist centres, and so may not reflect practice and outcome across the whole of the UK (Yu et al, 2009;Chase et al, 2010).…”