Big businesses mulling a UK IPO should get on with it – now would be a great time to prepare for a listing.

True, market volatility has meant that the amount raised on London's Main Market this year to May 24 is 68% lower than in the same period last year, according to Dealogic, and uncertainty abounds in the weeks leading up to the June 23 UK referendum vote on whether or not to remain in the European Union.