Back to the very lowest price bracket for rack toys with these, which are - without doubt - Interesting Toys. A shilling (1-) was 12 old pence, which became 10 New Pence - I think! Heay, I'm a child of post-decimalization, no good asking me about florins and shit, init!
It seems that these were a 'brand'; for as I find more of them, the evolution of the card art through the 1960-70's is clear and the contents are pretty consistent on colour/style, with a slight improvement in value for money in the later 1970's multi-blister versions.
I'd like it to be a large 'G' with the lower line being an artistic PMS as that would be the Gardener's firm; a stalwart of the colony's toy industry before 1973, but I know it's just wishful thinking, it seems to be some kind of sea serpent, or maybe a graphical realisation of a Chinese character/pictogram?
A quick look at the figures in the right-hand card might lead you to think they are Britains copies, a closer look will reveal Airfix in the mix, but a study of the figures shows that actually they are copies of the EKO copies of the aforementioned firm's figures, the Airfix poses having the egg-shaped bases of the EKO, rather than the usual square ones of Airfix, and with the crawling figure EKO also copied being present.
29 minutes ago