Thanks very much to everyone for the input.
I was in fact planning to ‘run around’ the shops in the area looking for anything that would work, I just thought if there were any quick tips out there regarding technical support for a part number, it would be good to pursue this in parallel with the local running around, in case I came up short. Fortunately I was directed to a place which had a control cable in stock which was made by a different manufacturer, but it fitted quite nicely indeed, although just slightly shorter than the original.
Just in case another Lagoon 380
owner with Volvos installed has the same drama, here are some of the details I picked up during this little saga……
Control cable manufacturer: Teleflex
Port side throttle and gear
selector control cables part number: CC313-0800. (Qty 2) (8 metres long)
Starboard side throttle and gear
selector control cables part number: CC313-0950. (Qty 2) (9.5 metres long)
Possible initial contacts for Teleflex in Europe
: (FYI: I didn’t end up having to try these numbers, so they could be totally wrong!)
S-421 23 V. Frölunda, Sweden
Tel. + 46 (0) 31 89 44 50,
Fax + 46 (0) 31 45 74 64
1 Factory Road Upton, Poole, Dorset BH 16 5SJ, England
Tel. + 44 1202 632882