Processing visa for other country if my H1B petition is selected in lottery

My H1B new petition for FY2015 is selected in lottery and currently it is under Initial review. Now am getting an opportunity to travel UK for different project with assignment period of around 1 year. Kindly suggest if I can take up this opportunity or it will affect by anyway if my H1B petition is approved during this period and if I didnt go for stamping during this 1 year period of stay in UK. Currenty I am in Chennai. Appreciate your response at the earliest.