http://news.bbc.co.uk/1/hi/business/3974559.stm
Their website says
We are currently accepting orders for delivery on Thursday 11th November. We will continue to accept orders whilst we have the capacity to maintain our next day delivery promise. Notice of any changes to our service will be communicated immediately at Screwfix.com.
I haven't had any problems with them, but my last order was a few months ago so things could have changed