I went to the garden centre and look what jumped into my car!
I wanted to get some more big pots and all I was planning to do was see what was available and the cost, etc. The three really large pots I ended up with weren't priced so I asked one of the assistants for help (and I also wanted to be sure they were big enough for the plants I've earmarked to go in them) - she didn't know the price, and obviously couldn't be bothered to go and find out, so she said I could have them for £14.99 each. As the others of a similar size were at least £29.99 each I bought them there and then ... and when I went to pay, the man on the till misheard the price and only charged me £13.99 each. Bargain!
I went back to get the compost (buy 2, get 1 free) and a few more plants - Freesias White River, Delphiniums Excalibur White, Semiaquilegia Sugar Plum Fairy and an assortment of plants for the hanging baskets.
I need some help to move the existing big pots around so these will get placed and planted up tomorrow ... providing I can persuade someone to help me!