so for the sake of £5 pound your gonna buy a brand new bottle with 5 year test for £130 or u can buy this for £85 wait for the 4 year hydro to run out then pay the £40 for a re test and get another 5 years. so basically get a bottle for £130 with 9 year worth of use.
if only i had the money i would have this off u. ill try and sell some gear and get some money together