oh yeah …lol!
You do not need an additional module for the pi.
There is s thread which tells you how to set it up.
If I can follow it then it must be straightforward. 
I will find it and attach it.
EDIT: Bit of a long thread but it does cover everything.
For some reason Legrand products are not common in normal retail electrical stores.I just went to my local electrical wholesaler and they ordered in the parts in for me (Legrand have a list of re-sellers on their site, so you should be able to find one close to you). I also got some of the button modules in bulk off eBay. They worked out ~£10-15 per complete unit, which I thought was pretty good.
Just to add - I have a 6 gang switch with 4 Fibaro devices in a 35mm deep back box. It’s tight - but do-able.
WOW 4!!, how on earth did you manage that with the switch gear for the physical switches?!
would love to see a picture of that!
how would the Fibaro cope with 2 way light switching? would I need a slave type module or something?
Yes, it’s a double back box. 2 switches give power to Philips Hue so don’t need modules. I’ve taken the mantra that multiple lights need fibaro, single lights Philips due to cost. I’m new to this so happy to be corrected.
looking at the depth of the wall where the light switch is fitted, I don’t think it’s going to fit so if I was to wire the module in the ceiling, how would I wire this?
Thank you Robin, much appreciated!
Just a thought, this will be for my lights in my hallway which are 2 way but if I did something similar to the lights on the landing which are only one-way, could I use a wireless switch to control them? just annoying when sometimes you walk downstairs and you’ve left the lights on and you have to walk back up!
Too tired to answer in detail today but the battery powered popp/Devolo switches work well with SmartThings, come in many different color options, and have a very good custom device type handler created by AdamV. The popp Switch talks to the hub and the hub talks to whatever micro is controlling the light. ( or to a smart bulb if you are using those.) So you can put your two-way auxiliary switch anywhere you want. 
That’s probably the most popular option in the UK for a virtual two way using a battery powered device, and it’s a good one.
As far as the other options that Robin mentioned like motion sensors, etc. , see the UK lighting FAQ:
Wow! that’s a lot of info right there and I’m grateful for your efforts @anon36505037 and @JDRoberts , thank you.
So If I wanted to control say the Fibaro unit which will be installed on the ground floor from anywhere in the house, could I buy a battery operated switch and use that? I just need it to switch on and off. Also, from reading some of the notes I read somewhere that in order to use automation - remotely control the lights, you have to leave the wall light switch in the ON position? would I have to do that with my Fibaro setup?
I had this conundrum 6 months ago before I embarked on a ground floor refurbishment.
Ended up with Smartthings and a collection of fibaro dimmers and relay switches. It works really well, if a little expensive for the fibaro units.
I went for fibaro zwave for the reliability, the feedback (so in the app you can see if the light is on or off - not available with LightwaveRF), and the fact that it’s completely natural to use - no need to leave light switches on.
For switches I’m using MK 3-way retractive rocker grid switches from screwFix. They look good in stainless, and you can make up your own configurations by snapping modules together. The rocker switches mean you can press up to brighten and down to Dim.
I’m now using the Sonoff relay switch modules where possible, as they are so much cheaper, at £7 a time. Need a bit more DIY to integrate them but that’s part of the fun.
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@Meirion_Williams thanks for that!
Do you have any further info/links to how I could use the Sonoff relay? this will work in the UK right?
Sure, there’s a lot of info in Eric’s Sonoff thread here:
I haven’t worked out how to use these for regular light switches yet (ie hidden in the wall), but they’re great for lamps.
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would it be possible to have back plate with the possibility of having 3 switches and for one of them you have push button remote? the other 2 will be wired to the light circuit. I’m happy to mod this if possible
so what type of switches would I need then to act as “buttons”?
I’m a little confused now - sorry. So what I was trying to do is use something like this faceplate
having the Momentary/Retractive modules in the 2 of the gangs and then having something in the 3rd gang which was the remote z wave button?