[Neil]

You can empty most of the water out by taking the drain pipe from wherever it goes - either shoved in a vertical drain pipe or pushed onto another fitting under the sink. When you take it off put it in a bucket low down. This will allow it to drain. You might need to end up with it very low to drain all the water out. Collecting it in a dust pan then pouring the water down the sink will work for the last water. By lifting the drain pipe high you will stop water coming out.

Trouble is you might have to pull washer out to see where the drain goes and it will be heavy full.

Sound like either your drain pump has failed or it is blocked up with something.

Often you can drain water out of a little pipe where the filter is. This is very slow but if it has one will mean you can do it without moving the washer.