SUCH A TERRIBLE COMPANY. AVOID!
Ordered my plants nearly 2 weeks ago and they haven't even processed my order! Given the delays, I asked to cancel my order, but then they said it had been processed so couldn't be cancelled, but then when I ask where my plants are they said it hadn't been processed. I have dealt with 3 different customer support staff and they all copied and pasted the same message.
I have now given up and accepted that I have lost £100 that I paid to Gardening Express. They have no intention of sending my plants or giving me a refund. Instead, I ordered some plants from Amazon for the same price and they were great, arrived in a couple of days and really good quality.
SAVE YOURSELF THE TROUBLE.