This is a link
https://www.ii.co.uk/ipos/4e29/documents
It's a five year Gilt maturing in 2029 with a coupon of 4.125% payable half yearly.
The price to retail investors is decscribed as
Non-Competitive Auction Price (i.e. the average accepted price for the gilt).
Presumably the coupon has been set so that the issue price is expected to be around par ie 100.
I think there was a Budget announcement that the Government was looking to finance some of its borrowing from private investors.