I got the spare seat modified" as intended" to single race seat style.
This was done by local business in Penzance .£75
I am well pleased with new look, also when riding ,besides having something to rest my backside against ,I feel as i am sat more in the bike than on it. An unexpected bonus ! although it was not intended to be a double seat , my partner likes the new higher position unintentianally created for the passenger