I think you need to post some pics and dimensions so that we've got something visual to go on.

With a decking, it is always best to remember that you get what you pay for so material quality is paramount. The support structure is also extremely important and a composite option should be considered as you will have no issues with rot. If your budget is really tight, then have you considered looking on ebay or the internet for a reclaimed hardwood? It may look tatty and discoloured however you can generally buy this cheaply and then renovate it with a jet wash before re-finishing. You can rent a great jet wash from HSS which will strip any algae, etc., quickly and leave the wood looking renewed. A hardwood will last for a very long time if treated properly and this applies to the reclaimed option as well.

Looking for advice on what material to sit a hot tub on? We have an as yet ‘unlandscaped’ area of the garden adjacent to the garage wall. Photo attached. Have recently had the garage wall rendered in white and now has 3 wall lights and power outlet so seems a good location for the hot tub. The ground is slightly higher next to garage as is on a slope running down to the patio where the photo is taken from which is next to the house. Was thinking possibly composite decking to mix up the materials as we have 2 patio areas already. One in silver sandstone and one in grey slate. Is either a better option for weight of a hot tub? Thanks

Thank you both for your thoughts :) I have been told that thermawood Iroko (from QTD) has more resilience and is therefore longer lasting - but I cant find another company for comparisons. Trying to decide if hardwood is a better option, and its more beautiful of course. But not sure if Iroko is good re noyt beingtoo slippy. If anyone knows, Id love to hear.