I wanted to buy them from Argos but were oos :(
Tesco deal is also good one:

You can have it delivered for free if you sign up for delivery saver - its free for one month now and can be canceled anytime -
http://www.hotukdeals.com/deals/tesco-anytime-delivery-saver-free-for-1month-can-canceled-any-time-free-delivery-2426726

Add something to your basket for £16 or more and you can use code - TDX-HTNH at checkout which saves you £10 on £75 spend

description:
Lightweight and easy to use, this Flymo Easimo lawnmower and mini grass trimmer set are perfect for small to medium gardens. This twin set will give you an amazing lawn and with neat edges.

This lightweight 900W lawnmower features 3 cutting heights and an ample 29 litre capacity grassbox, while the trimmer has a 230W motor and a single line feed for trimming.

For spare parts for this trimmer please see catalogue number 210-4015.

Comes with a 1 year manufacturer’s guarantee.

Lawnmower features:

Corded.
900 watt electric rotary motor.
32cm Metal blade
Cutting heights ranging from 2cm - 6cm.
29 litre grass collection box.
10 power cable.
Safety switch.
Weight 7.9kg.

Grass trimmer features:

Corded.
230 watt motor.
Cable length 6m.
Safety guard.
Weight 1.5kg.