Just pickup a 4 socket power extension lead from your nearest hardware store.  

it's easy, but I guess it won't fit in the existing space, so you'll need to cut gib/wall anything else that is there and so on.

kobiak:

 

it's easy, but I guess it won't fit in the existing space, so you'll need to cut gib/wall anything else that is there and so on.

 

I did this some years back. It did fit , as is .
The extra length was external to the gib/wall .

Just be aware, its fine if you are running phones chargers, radios etc,

Don't expect to be able to run another 2 2400W fan heaters, :), 

Yep, and you are even allowed to do this yourself as long as you own and live in the house - you should know what you are doing though of course. If you aren't sure, don't touch it. 

Just get the suitable orientation power point - if your current one is vertical, then you want to get a vertical 4 way board, if it's horizontal, then get a horizontal one. It should be a straight swap that way. 

One of these. 

https://www.electricaldirectltd.co.nz/product/2275-HPM-Excel-Life-4-Gang-Powerpoint-10A

https://www.electricaldirectltd.co.nz/product/2006-PDL-Quad-Horizontal-10Amp-Switched-Socket

https://www.electricaldirectltd.co.nz/product/2003-PDL-Quad-Vertical-10Amp-Switched-Socket

Depends on how the old double is mounted. If its got a flushbox or C clip then youre fine. If its direct fixed to the wall then you may have to sort out new fastenings for the new 4/5 way powerpoint. I have replaced most in my garage with 5 way deta ones from bunnings over the worksurfaces because its neater than mounting powerstrips with the resulting cable they have. All good sofar.

rogercruse:

 

Just pickup a 4 socket power extension lead from your nearest hardware store.  

 

100% this. If you run out again you can even buy a 6 way board. As mentioned above though, don't overload it. It's still only rated to what, like 2400W?

Not keen on external power strip. I want it to look tidy. I appreciate that the load will be restricted to about 2,000 watts

I don't think there is an Iconic surface mount, pretty sure they are all flush. Unsure how this mounts with a flush box attached next to a stud. 

https://eref.se.com/au/en/pdl/product-pdf/PDL395H4-VW

https://download.schneider-electric.com/files?p_Doc_Ref=PDL395H4-VW&p_File_Type=rendition_1500_jpg

Found this image - so looks like it won't mount in a normal flush box at all. Not actually sure how you are supposed to mount that really? 

https://cdn.shopify.com/s/files/1/0063/3287/4804/products/PDL395H4_2048x2048.jpg?v=1527297802

Edit again - here you go

https://www.se.com/nz/en/faqs/FA305634/

Depending on which side of the stud that current one is mounted to, you might not have enough room there?

The fittings are part of the pdl iconic range...

Looks like I have to buy the front piece and a backing piece and perhaps hack a bigger hole in the wall. 

Is this what i need?

https://www.trademe.co.nz/building-renovation/electrical-lighting/switches-switchboards/sockets/listing-2686933084.htm

Yes. But check my above post edit in regards to mounting. 

I did just find a mounting block for these.

https://www.se.com/nz/en/product/PDL395H4MB-VW/mounting-block-iconic-quad-socket%2C-push-in-function%2C-white/

But that's not an awesome solution as you'd still have one end only screwed into gib. 

Stick with Clipsal / PDL and not Bunnings spec stuff.

That trademe link looks what you need. As mentioned one screw will just have to go into gib. So just use a suitable screw in wall anchor. Not a major as unless you have off the socket, it will hold solid.

OP here.

I will have a good prod at the fitting tonight. The cover is supposed to come off these PDL iconic range sockets as far as i can see. 

Hopefully all I then needs are these two parts

PDL395H4-VW

PDL395H4XXUAG

...and bob's my uncle. 

PS, in the garage I have 2 * 6 way extension plug things mounted above the workbench (with 3d printed retaining fittings). It's amazing how many plugs you need. 

Thanks everyone for the help. 

Next project, add some bluetooth dimmers.