Ok, I've decided on a phone - The Panasonic KX-TCD290 - mostly due to only being able to find a few reviews of phones, but this one stood out well enough to be one of the few phones that have been reviewed and seems great!...
The features that make it stand out over other phones are as follows:
Superior build quality,
Much longer range than other DECT phones,
Volume goes louder than most phones (on handset and loudspeaker),
2.5" headset jack.
Not the most attractive phone, but I like it, because it looks strong!...
Most online shops sell it for around £70 + delivery, but I've ordered it for £68 including delivery from an Amazon marketplace shop.
A review of it is found here
http://www.trustedreviews.com/mobile...-DECT-Phone/p1