I tried the machine with the outlet hose in the bucket and it did a quick wash with nothing in there after leaving it turned off overnight. So I tried with some clothes and it worked for 3 wash loads, no draining problems. The missus then put some old towels and blankets in there that we use for the dogs, same amount as usual, 2 large blankets and 5 hand sized towels. It stopped halfway through before it put the conditioner in, but it drains the first two lots of water it puts through the machine. If I turn the machine off and then back onto drain it clears the water. I managed to split the load into two, rinse them and then spin. I tried a quick wash after this and it stopped halfway again with the LED blinking 3 times.
I turned the machine off overnight and tried it this morning on a quick wash with no clothes, it did this ok with no issues. I have just done another quick wash with clothes and again it's fine. So I'm now thinking it might be something else cos if it was blocked somewhere how comes it's draining and finishing a cycle sometimes and others it's not.
The fact I left it off overnight and then it works in the morning is making me think it might be another issue.