I've asked about availability and RRP from one of my local gunshops about this synthetic HW30S
Just received a reply below:
Hi I have just given Hull cartridge co a call and they advise that they hope that the Hw30s synthetic was launched in March at the IWA trade show and that it will be available to buy in around 2-3 months time, no indication of price at present.
Looks like we should be seeing them hit uk gunshops soon