Compukit Advert - January 1980
From Personal Computer World

Compukit UK101 - Low-cost Superboard in kit form
The Compukit UK101 was effectively an unauthorised UK clone of Ohio Scientific's Superboard - the one-board computer that, via the updated version the Superboard II, gave rise to Ohio's "big room" machines like the C3-B.
Originally produced in kit form, with a series of articles in Practical Electronics covering how to build it, and with parts available from Comp Shop (the advert's sponsor), the UK101 improved slightly over the Ohio original by having a 48x16-character display (instead of the original 24x24) as well as having UK UHF output and a UK transformer[1].
It retailed for £250, including VAT, in kit form - about £1,420 in 2023 money.
This advert also offers Atari's legendary Video Computer System (later on known as the 2600) for £160, or £900 in 2023.
Sources
Text and otherwise-uncredited photos © nosher.net 2023. Dollar/GBP conversions, where used, assume $1.50 to £1. "Now" prices are calculated using average RPI per year.