Mac

All prices for 'Mac' include the approximate cost of delivery to an address within the UK.
Amazon

The iMac "Core i5" 2.5 21.5-Inch Aluminum (Mid-2011) is powered by a Quad Core 2.5 GHz Intel "Core i5" I5-2400S (Sandy Bridge) processor with a dedicated 256k level 2 cache for each core and a 6 MB shared level 3 cache. In lieu of a system bus, it has a "Direct Media Interface" (DMI) that "connects between the processor and chipset" at 5 GT/s. Upgraded to 8GB of RAM (1333 MHz PC3-10600 DDR3 SDRAM), a 500 GB (7200 RPM) hard drive, a vertically-mounted slot-loading DVD±R DL "SuperDrive", and AMD Radeon HD 6750M graphics with 512 MB of dedicated GDDR5 memory.

Amazon

MacBook Air gives you 1440x900 pixel resolution on a display that measures a mere 4.86 millimeters (0.19 inches) thin. And LED backlighting makes colours bright and vibrant from edge to edge. So whether you're editing photos, perfecting a presentation or watching a film, you're going to love what you see. Let your friends and family see more of you with the 720p FaceTime HD camera.

Amazon

Apple MQ2Y2B/A - 27-inch iMac Pro with Retina 5K 3.2GHz, 8 Intel Core, 32GB 2666MHz DDR4, 1TB SSD