Well as to be expected City plumbing lied!!!!
Speaking to the branch, they have not received the item, and they do not have it in stock at all and just buy it direct from National shower spares (Where I went in the first place) when they need to .
They have not been given an ETA but don't expect it to be less than 4 weeks.
Managed to find one on ebay - £25+ for a part that is £6.60 inc VAT
Hopefully this overpriced one will turn up late next week!
Spoke to some drone from City plumbing's head office "there are delays in supply" - how can there be, when you clearly indicate you already have it in stock you ignorant muppet?