Reddit mentions of FROGG TOGGS Men's Ultra-Lite2 Waterproof Breathable Protective Rain Suit, Green, Medium

I would just grab a Frog Togg in the mean time. Cheap, light and will do the trick in the interim.

If you think you can be comfortable on a CCF pad like the z-lite then go for it. It'll be lighter, cheaper, and much more durable than an inflatable. I personally don't enjoy them as much, so I opted for the neoair. It's plenty durable if you pay attention to sharp things (rocks generally won't puncture it), but it does cost more. If you can test any of them out I highly recommend that because if a CCF pad works for you then you're golden; cheap, light, durable. For me I was willing to spend more to get a good night sleep on the trail, and I'm fine with watching where I drop it to protect it more.

My go to recommendation for rain wear is a Frogg Togg jacket. Amazon UK (I'm assuming you are in UK, sorry if not) carries them for cheap, and they do a solid job of keeping you dry. Some folks complain about durability, and they aren't designed for hard abuse like bushwhacking, but my pair is 2 years old and still going strong.

Frogg Toggs - cheap, reliable, but kind of fragile. I like beauty in my fenders so I run Velo's

I'm unfamiliar with that brand, but the description says the hood is helmet compatible and I would be concerned about dealing with a lot of hood material even though it can cinched down. Here is the Frogg Toggs that I use:

https://www.amazon.co.uk/Frogg-Togg-UL12104-09MD-Ultra-Medium/dp/B007X5XDOK/ref=sr_1_1?s=clothing&ie=UTF8&qid=1537840601&sr=1-1&keywords=frogg+toggs+ultralite

These are just my preferences, anything waterproof that you like that is also acceptably light will do.