Hi Paul,
You should use something like this: https://www.wickes.co.uk/Deta-30A-12-Way-Connector-Strip/p/710112 and cover it over with one of these if it is temporary: https://www.wickes.co.uk/Wickes-Single-Blanking-Plate---White/p/710192
This is safer than leaving the cables sticking out with...