Sainsbury does sell KTC coconut oil as well in some stores. It's £1.49 per 500ml jar (440g). I usually buy 10 or so when I pass a Sainsbury that sells them which lasts me a while.
KTC are very nice to deal with and if you make a lot of soap and also use their Almond Oil and Palm Oil, they can deliver to you. But you have to order 1 pallet (Euro Pallet) of it, a mix of the 3 oils is fine. Might be worth considering if there are other soapmakers close by and you can split the pallet between you.
Just checked out soapmakers store, and if I just order coconut oil, then they are way more expensive than my corner shop...
Sainsbury price: 5kg = £16.93 (£1.49/440g)
Corner Shop Price 5kg = £19.20 (£1.69/440g)
Soapmakers Store 5kg = £12.50 + £3.40VAT + £6.95 delivery = £22.85
On top of it, if it comes in 1kg blocks, it's going to be a nightmare to handle. The corner shop oil comes in handy 500ml jars which can be melted in the microwave or softened in the sink. I am having enough of a hassle with the 11kg Palm Oil blocks from KTC, but palm oil is a lot softer and scoopable, coconut oil is usually rock solid here, apart from 2 weeks in August.