LONDON (Reuters) – Britain has delayed imposing post-Brexit import controls on goods from the European Union until the end of next year, saying retailers were facing too many other cost pressures and it did not want to risk adding more fuel to inflation. Britain left the EU’s single market in January last year and it has delayed implementation of its full post-Brexit border controls on several occasions since then. The government said on Thursday that Russia’s invasion of Ukraine and the recent rise in global energy costs were having had a significant effect on supply chains that were still re…