Thanks Bob. The main specs in more detail are:
Thinkpad L450 £755
Intel Core i5-5200U Processor (3MB Cache, up to 2.70GHz)
OS: Win 8.1 (options for 7 pro or 8.1 pro)
Display: 14.0"FHD (1920 x 1080), IPS, AntiGlare, with WWAN
Memory: 8GB PC3-12800 DDR3L SDRAM 1600MHz SODIMM or 8GB PC3-12800 DDR3L (2 DIMM)? (also options up to 16GB)
Graphics: AMD Radeo R5 M240 2G
Keyboard: Keyboard - UK English
Pointing Device: UltraNav (TrackPoint and TouchPad) with Fingerprint Reader
Camera: 720p HD Camera
Hard Drive: SSHD 500GB5400 8GB Cache (several options for size, speed. cache etc and inc SSD eg. up to 256 GB Solid State Drive, Serial ATA3 OPAL2.0 - Capable (+£70 seems quite good value but does it make much difference to my sort of work?)
Rear Battery: ThinkPad Battery 6 cell Li-Ion (47Whr) Cylindrical (up to 7.7 hours)- (option for 6 cell Li-Ion (72Wh) Cyl HC Rear - would that mean 11.5 hours and would it weigh more?)
Wireless: Intel 7265 AC/B/G/N Dual Band Wireless + Bluetooth Version 4.0
Weight: Starting at 4.25 lbs / 1.92 kg
Ports: 3
x USB 3.0, 4-in-1 card reader (SD, MMC, SDHC, SDXC), audio/headphone
combo jack, RJ-45, mini DisplayPort, smart card (optional), FPR
(optional)
Thinkpad Yoga 14 £818
Intel Core i5-5200U Processor (3MB Cache, up to 2.70GHz)
OS: Windows 8.1 64 (option for 8.1 pro)
Display: 14.0"FHD (1920 x 1080) LED,IPS, AntiGlare, Multitouch, Black
Graphics: NVIDIA GeForce 840M 2GB
Memory: 8GB PC3-12800 DDR3L SDRAM 1600MHz SODIMM (top spec offered)
Keyboard: Keyboard Backlit - UK English
Pointing Device: NO Fingerprint Reader, Black Cover
Hard Drive: SSHD 500GB5400 8GB Cache (several options inc 256 GB Solid State Drive, Serial ATA3 OPAL2.0 - Capable +£100 (maybe if worth it) or 512GB Solid State Drive, SATA3 +£236 (seems too pricey))
Battery: 4 cell Li-Polymer 56Wh (up to 8 hours, no options)
Wireless: Intel Dual Band Wireless-AC/B/G/N 7265, Bluetooth Version 4.0
Weight: Starting at 1.9kg (4.2 lbs) / 21mm (0.8") thick
Ports: 2 USB 3.0, 1 USB 2.0 (always on), 4-in-1 card reader, HDMI, Lenovo OneLink Technology, combo headphone/microphone port
Thanks for your help. Ian