Found it this morning in Tesco extra Pontypridd. Still shows £50 in Tesco Direct, so I appreciate it could be store specific deal, great price though.
Some description from Tesco website:
The Black & Decker GT4245 420W hedge trimmer is a versatile, durable and easy-to-use tool ideal for the efficient trimming of bushes, smaller hedges and small tree branches. Featuring a powerful 420W motor and kitted with a 45cm long blade, this hedge trimmer makes light work of most trimming tasks. It can also cut small branches up to 16mm diameter.
Thanks to its balanced design and weight of 2.1kg, you can use it comfortably and continuously for long period of time with a minimal impact on your arms, shoulders or back. Its weight is distributed evenly between the blade and handle for improved balance and sense of security, especially on a vertical cutting line because a higher proportion of hedge cutting occurs on the vertical rather than the horizontal surface.
The GT4550 is a fitted with sharp, metallic, dual-action asymmetric blades to reduce vibration and give an optimal result every time. It is fitted with a smart, two-handed safe-start switch to prevent accidental starting and there is a large protective guard to shield the end user from flying debris. The GT4245 features a simple, built-in cable management system to ensure the delivery of safe, continuous power.
The product comes with 2-year guarantee.
I'd try to post receipt in the first comment