Speed defies gravity (SDG) alloy seatpost and saddle. They only have white saddles in stock.
I already have an I-Beam set up, bought this as a back up in case of theft/ wear and tear. I find the seat comfortable, but the main benefit from my point of view is the lightness of the set up.
Several other generous deals are also available on other SDG products.
Free delivery for spends above £9.
TCB is offering 2.02%
If you sign up for Chain Reaction emails as a new customer, before buying anything from them, you can also get £5 off a £50 spend, but it is only valid for 1 week from the date of subscription.