[Jamie Butterworth]

Well, i have a problem, realisticaly i am going to need to fit a outside tap to allow me to use a hosepipe or irrigation system around the garden as filling 20 odd watering cans a day isnt realy feesible.
Trouble is, the wall in front of the kitchen sink is made from plastic so im not sure if it would be suitable to add the pressure of a tap to it.
I have tried buying a adapter for the inside tap to attach a hosepipe to but that didnt work.
However, either side of the plastic, is brick wall, would it be possible for my to drill a small hole, and attach the tap to the brick wall and connect it the sink somehow using a flexible water pipe?
Sorry, im a bit confused

[mumofstig]

yes is the answer, you can get smooth flexible waterpipe, nowadays with push fit connections.

You can get complete kits with a tool that cuts into the mains pipe 
here is an example http://www.screwfix.com/p/outdoor-garden-tap-kit/10101

[Swing Swang]

Drill through brickwork and attach outside tap, then plumb in feed from rising main. My guess is that if you do this before the main stopcock in the kitchen you'll need to put another one. There should be plenty of ways of disguising the extra pipework form inside the house by using kitchen cabinets/cupboards/through the cavity/boxing in. I'm sure that there will be a 'correct way', an 'OK way', and a 'Mr Bodgit way'! Before taking the third way remember that the outside pipe will get quite cold and condensation may form on it.

[arugula]

Don't forget to insulate and/or isolate the tap to cater for low temperatures.

[grinling]

You will also need to be water metered with an outdoor tap. Can you fit water butts/ guttering etc as plants prefer non tap water?

[Ice]

I recently fitted one of those outdoor taps that mumofstig mentioned.  Very easy indeed, but you do need the right drill bit and a steady nerve cutting into the water pipe.

I've never heard that you need a water meter if you have an outdoor tap grinling.  But anyway, lots of homes have them nowadays.

[Jamie Butterworth]

We are on a water meter anyway, but we have also been looking into a water butt, could you fit an irigation system to one?

Thanks for all the replies everyone

[Lardman]

Why / how is the wall made from plastic ?

The kit at screwfix requires a 23mm counter bore to sink the the backplate and joint. Thats a very big drill bit !

Hole in the wall (16mm should do), attach one of these http://www.screwfix.com/p/comap-hose-union-back-plate/82202 and an outside tap with check value on the outside, then connect to the rising main AFTER the stop cock.

Use either a self cutting tap  http://www.screwfix.com/p/self-cutting-tap-15mm/13768 and a flexible hose with pushfit/compression on one end and 3/4" BSP on the other.

Id do it properly with solder fittings but theres no reason not to do it with compression or even pushfit.

[trev_pulsecity]

I expect he means the wall is clad in uPVC, common on modern homes (built in the last 30) years. Helps to cover up the fact they put the Work Experience boy (or girl) in charge of the brick (or block)work.

You can still put an outside tap though it, though given the choice, I would try find some masonry to fix it to.

As for plumbing, best to avoid the self cutting kits, they are not bad but you are essential cutting a hole in the side of watermain, no way of knowing how long those self cutting taps will last and they are more tricky to replace.

Polyplumb or easy-fit plastic fittings are the way to go, unless you have good soldering skills.

Then the barrier pipe can be taken right into the outdoor taps compression fitting, insert, olive and some petroleum jelly to seal it.

This works best if the pipe you are supply from is copper, although it is also plastic its not too difficult. Definitely after the stop valve and give the branch to the outside tap its own stop valve to turn off in October as well.

[Jamie Butterworth]

Thanks for the advice

I think my grandparents are keen to get the job done to a high standard and as none of us have much experience in fitting one theyve asked there plumber friend to fit it

[Rangerkris]

Thanks for the advice

I think my grandparents are keen to get the job done to a high standard and as none of us have much experience in fitting one theyve asked there lumber friend to fit it

What's he going to make one from wood ? (Sorry) 
I am guessing that's plumber friend

[Jamie Butterworth]

Aye, should have been plumber

[8doubles]

As for plumbing, best to avoid the self cutting kits, they are not bad but you are essential cutting a hole in the side of watermain, no way of knowing how long those self cutting taps will last and they are more tricky to replace.

Also with the self cutting kits a little circle of copper pipe gets pushed into the mains pipe.

Where it goes nobody knows , possibly into the c/h boiler !