Artist Tracey Emin to feature in promotional video for campaign, which is looking for £10m in online fundingAn online crowd-funding campaign to build a £10m open-air swimming pool in the middle of the river Thames in central London is to launch next month.Initial designs for the Thames Baths, which is to open next year on the Victoria Embankment if planning permission is granted, feature a 25-metre by 10-metre main pool, filtration system and pool-side decking.