Looking to use a poe switch in the loft but no power, so i am looking to use a pair of injectors using existing cat5. possible?

PoE and PoE-PD are different. If you need a switch that does PoE for things connected to it (APs, cameras, phones, etc.) you need a PoE switch (e.g. this one). If you need to power the switch itself over Ethernet you need a PoE-PD switch (e.g. the Netgear GS108T-200UKS). If you need both, you need a PoE-PD switch with PoE (e.g. the Netgear GS516TP-100EUS), some way of powering it (PoE, power socket), and at the moment if your devices need 802.3at there aren't any PoE-PD + PoE+ capable switches.

do not have a degree in computer science - will this give me four wired connections to my 4 pc's and does it have ipv6 in it - believe essential for running home group on W7 - current router only has ipv4.

Yes I do as it happens, and a MCSE. Please don't be so harsh, only trying to help in my replies. Yes it will give you 4 wired connections at 1GBs if your hardware supports it, or will auto negotiate speed if your hardware does not. The first 4 ports on this switch are POE (power over Ethernet if required, if your equipment is compatible, please see TPLinks website for details). It will route IPV6 and IPV4 with no problems. By default Windows 7 only uses IPV4 anyway all versions both 32 and 64 bit. So if you can access the internet with your present router config you will be ok. Ask me another question if you wish and will tell you how to make W7 cough up it's IP config. Hope this helps.

Does the unit come with a 230V power supply unit as it is not shown?

The switch I has was "TP LINK TL-SG1008P which did come with a separate power supply. Your model is TL-SG108PE which is slightly, different but I'd be surprised if it didnt include the PSU also. Hope that helps. Include Extra Protection? Check below if this cover meets your needs: Amazon Protect 2-year Breakdown & Accident Cover for £13.50 Amazon Protect 3-year Breakdown & Accident Cover for £16.00 Quantity: Add to Basket Turn on 1-Click ordering Deliver to Antony - FRINTON-ON-SEA CO13 9JZ Add to List Other Sellers on Amazon Add to Basket £56.99 + FREE delivery Sold by: BESTBUYIT Add to Basket £64.06 + FREE delivery Sold by: Buyur Add to Basket £54.39 + £9.68 delivery Sold by: EURO DK 30 new from £45.39 Have one to sell? Sell on Amazon

Product dimensions	10L x 9.8W x 2.5H centimetres
Item weight	8.82 Ounces
Voltage	53.5 Volts (DC)
Case material type	Metal
Maximum power	65 Watts
Upper temperature rating	40 Degrees Celsius
Interface type	RJ45, PoE
Data transfer rate	1000 Megabytes Per Second
Current rating	1.31 Amps
Global Trade Identification Number	06935364083229
Manufacturer	TP-Link
Item model number	TL-SG1005P
Series	TL-SG1005P
Are Batteries Included	No
Item Weight	250 g
Guaranteed software updates until	unknown

TL-SG1005P 5-Port Gigabit Desktop PoE Switch with 4-Port PoE+, Professional High-Power Ehernet Splitter Extender, QoS for Traffic Prioritization, Intelligent Power Management, Metal Casing

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