The company was expanding rapidly, turnover rose to £450,000 in 1959 and in 1960 Allgood moved to its present address in Euston Road. The building was named Carterville House after the founders and was officially opened on 23rd January 1962 by Sir Charles Hambro KBE, MC.

With higher overheads, rapid expansion and a cash flow challenge, Allgood decided to sell the company to Union Corporation. "Nothing changed! " says Derrick Carter-Clout today. "Except that we had bosses to whom to answer." Union Corporation owned a number of companies but Allgood was known to be the jewel in the crown.

In 1963 the celebrated Danish architect Arne Jacobsen had been commissioned to design the new St Catherine's College in Oxford and, although Jacobsen's design of lever handle had been specified for the project, Knud Holscher, the project associate who had moved from Copenhagen to supervise work on the site, realised that there was a need in the UK market for a well designed, coordinated range of hardware. Together with Alan Tye - later to be a Royal Designer for Industry - who had worked in Jacobsen's studio in Denmark, they formed a design partnership to develop this and other product ranges.

In March 1965, Peter Thorley - shortly to join the company and who later set up Elementer Industrial Design but is now back at Allgood - introduced Paul Shirville to the young designers. On Paul's suggestion, Derrick Carter-Clout took the rough castings home to his wife who had spent her business life working in the couture industry and had a natural flair for design. After reviewing them for a short time, Joan Carter-Clout considered them marvellous and declared that it would be senseless not to go ahead with production. Paul Shirville, entirely approving of the concept, thus instigated their manufacture.

The range was to be named Modric - modular/metric - and within eight months 150 items had been designed, £100 000 invested in tooling and Newman Tonks (then Walter Rowley Ltd of Birmingham) began production. In November of 1965 Allgood launched Modric, the first modular and interchangeable range of door furniture, at the International Building Exhibition at Olympia. The show was a sell-out and Modric, dimensionally and aesthetically coordinated and with all items hand finished - as they remain to this day - and prices fixed for five years, was to take the architectural community by storm. Two regional sales offices, G&S Allgood (Birmingham) Ltd and G&S Allgood (Anglia) Ltd, were established and the following spring the first major Modric project, a housing development in Blackheath, was supplied.

The principle of modular unsprung components was revolutionary and Modric soon became a design classic. Today Modric represents a timeless, clean-cut range of door furniture in an array of metallic finishes and is known for its fine design and extraordinary durability. The range has evolved over time through new designs and enhanced technical features with Alan Tye always adhering to the original principles and never compromising this classic concept.

Allgood won several awards in the following two years, the first of a long succession. 1966 brought the Council of Industrial Design Award and the British Aluminium Design and Construction Award and, the following year at the International Building Exhibition, the British Aluminium Design Award trophy and first prize in the GAI's own Best Design in Aluminium Competition. In Glasgow Allgood won Best of British at the Duke of Edinburgh's Awards. The most notable Modric-specified project of that time was the British Pavilion at EXPO 67 in Montreal.

International markets opened up and in 1968 Bob Taylor, who had been appointed a Director of the Parent Board in 1961, set up an office in South Africa.

In 1968 the QE2 was built on the Clyde and the chief interior designer, architect Dennis Lennon, chose Modric for the door furniture and bathroom fittings. Modric's mix of aluminium and magnesium made it light and resistant to salt water and Allgood created many custom designs for the ship.