Hi MaskedDetector! Welcome to the forum! I'm glad you came here looking for advice before jumping into a purchase - too many folks make the mistake of buying a random metal detector when they are first starting out in the hobby, and unfortunately, there is a lot of junk out there. As with most things, you generally get what you pay for in a metal detector, and going too cheap or buying an unknown brand usually leads to disappointment.
I've never heard of those two metal detectors that you listed, which isn't a good sign right off the bat. When I searched for them online, the only place I found them listed for sale was on a website called "UK metal detectors". The site doesn't have any known brand of metal detector listed for sale (Minelab, Nokta, XP, Garrett, etc.), and worse, they have a heavy selection of Long Range Locator (LRL) devices in their "Mega detector" section. LRLs are nothing more than pseudoscience scams sold for outrageous amounts of money. Long story short, I would highly recommend staying away from the two detectors that you listed, and I certainly wouldn't recommend buying anything from that particular website. And as a side note, there is absolutely no way you are detecting coins or jewelry to 1 meter with the Reflex G6 - that's extremely unrealistic. Maybe something very large, like a small car??
Extremely expensive, name brand, flagship metal detectors are lucky to hit coins at 0.3 meters.
You're right, it's sometimes wise to avoid buying very expensive gear just to try a hobby that you're not sure you'll stay interested in pursuing. At the same time, buying an extremely cheap, off brand detector can lead to enough frustration that you'll end up quitting the hobby because the equipment performs so poorly and doesn't adequately represent the fun that can be had in the hobby. Keep in mind, if you buy a more known brand metal detector, if you find that the hobby isn't for you, you'll be able to sell the machine much more easily, and with minimal loss. An off-brand detector like the two you listed may as well just get chucked in the bin.
Rather than those two machines,
I would point you in the direction of either a Minelab Vanquish, Nokta Simplex, or Minelab Xterra Pro. These are all relatively inexpensive beginner machines with very good performance made by reputable detector companies. Each will be much more likely to give a more enjoyable metal detecting experience - but if you change your mind, you can definitely sell them to someone else to minimize your loss.
Not that I recommend buying a machine from Amazon, but this will give you an idea of prices in USD as well as features:
Amazon Listing: Minelab Xterra Pro ($269 USD...$214 GBP?)
Amazon Link: Minelab Vanquish 340 ($199 USD...$158 GBP??)
Amazon Link: Minelab Vanquish 440 ($299 USD...$237 GBP??)
Amazon Link: Nokta Simplex BT ($279 USD...221 GBP??)