Now, I'll start by saying I'm well aware of the potential for catastrophe here, which is why I want a better solution ;)

I got fed up with a certain someone hassling me about getting a dishwasher, so on the grounds that I didn't have to pay for it, we've now got one.

Now, the problem is, the only place to put it is not within convenient range of any easy method of plumbing it in.

It turns out that washing machines & dishwashers use the same 3/4"\20mm BSP connectors that standard garden hoses use (you can see where I'm going with this). So, I've drilled a small ~1.5cm hole through the gib into the laundry where there is a connector for the washing machine on the taps, and I've run a "standard" garden hose through this and connected it within an inch of its life to stop things popping.

I'm not sure how much pressure it'll take before these will pop but it seems pretty stable and everything works well, drainage isn't a problem as I've been able to adapt a drainage hose to safely run into the kitchen sink.

Short of major plumbing alterations, any suggestions for a less bodgy solution to this?  If I could track down a longer (approx 3m) high-pressure dishwasher\washing machine hose and a 20mm BSP Y-Splitter, then I could probably just hook it to the tap using that and it should be safe. Hardware stores don't seem to sell anything longer than the usual 2m hoses though. I'll need to drill a bigger hole to fit the connector through, so maybe a 20mm bridge-pipe rather than a big hole & sealant?

As it stands, despite the fact it seems fine, I don't want to find out otherwise when someone forgets to turn the tap off and the hose pops.

Any better suggestions gratefully received.