Mike Rice – 8 minutes ago  » 

Other than just trying it, is there any way of knowing whether my signal is marginal, or not?

What does your Youview box say your signal strength and quality is ? Do you ever get picture breakup (pixellation) ?

Mike Rice – 13 hours ago  » 

Signal strength seems to be between 65-70% (depending on the channel).

Signal quality 100%.

What do you think?

I think it will work OK. As they only cost £2.00 or £3.00 you might as well just try one out.

Mike Rice – 8 minutes ago  » 

Do you know where best to get a splitter from, then? Is there a specific spec or set of features I should be looking for?

Any uhf splitter will do the job. Have you a screwfix locally ?

http://www.screwfix.com/p/labgear-2-way-splitter-with-power-pass-all-ports/99105?kpid=99105&cm_mmc=Google-_-Product%20Listing%20Ads-_-Sales%20Tracking-_-sales%20tracking%20url&kpid=99105&cm_mmc=Google-_-Shopping%20-%20Electrical-_-Shopping%20-%20Electrical&gclid=CjwKEAiAodOlBRDCjr-UlJDjtVUSJABR7fxyiHxqmDYTb7iNU1eGqfnoXeWtBS5xpz_qEA-DZxVIyhoCYhLw_wcB

Or a toolstation

http://www.toolstation.com/shop/p66100

E-bay

http://www.ebay.co.uk/itm/TV-Splitter-1-AERIAL-TO-2-TVs-CONNECTORS-PROFESSIONAL-KIT-/151327787147?pt=UK_ConElec_TVAerials_RL&hash=item233bd6c88b

You will need some screw on f connectors for the above (supplied on the e-bay link.

The metal case ones are better quality than the plastic ones.

Maplin do one with Belling Lees but as usual they are very expensive

http://www.maplin.co.uk/p/uhf-tv-signal-splitter-1x-plug-to-2x-sockets-jm13p

Mike Rice – 8 minutes ago  » 

Looks a bit complex! What are the screw fixings on the side of the splitter box for; are you supposed to screw it to the wall?

Wouldn’t something like this do the job, as it seems simpler:

http://www.kenable.co.uk/product_info.php?cPath=263_264&products_id=7024

It’s so you can screw it to a wall (you don’t have too). It makes a neat installation. These are used by professional installers.

The item you link to is likely to have significantly higher losses than a decent one and is probably poorly screened. You can try one but if it causes issues it doesn’t mean that a decent splitter won’t do the job.