The singleton Rainbow 166A tender ship for the Black Triangle 126A fleet will be converted into a Sparkle 162A elint ship, DF have said. Both classes of ship are based on the Friendship platform, DF say that adding the required equipment and retaining the ability to support Black Triangle is possible, though some degree of modularisation will be required.
The first Sparkle is due to enter service next year, they will replace the Marconi EW fleet. 166-001 Rainbow is to trial some of the equipment intended for Sparkle later this year.