The Swedish Armour Historical Society has released a book called "Strv 103 Photo guide" and it has the following information. It appears the tanks were sent to Germany, and not Bovington.

In the autumn of 1973 the british army leased 10 Strv. 103s for trials. These took place in then West-Germany with british crews being trained inSkövde for some weeks. Above 34A CLAPHAM during a motor check. Below is COURAGEOUS.

The tanks were marked with their call signs in large yellow digits on the left hand tool-box 3A Company Commander 3B 2iC. The rest were marked 33, 33A, 33B, 34, 34A, 34B. Some tanks also had a name painted on both sides in white on black as CYCLOPS, CANADA, CAVALIER, COURAGEOUS, CLAPHAM and CYRENAICA. British registration plates were attached on the MG boxes underthe embrassures in the range 10XM01 to 10XM10.
Among the ten tanks delivered, there were three different colour schemes; olive drab, dark green and 4-colour.
Below, the image shows tanks on their way to Skövde railway station for loading.