>>2841264I would honestly avoid hammock camping this side of the year unless you're also willing to invest in a decent underquilt. The problem with a hammock is that even in a sleeping bag, the insulation is crushed underneath you, so you loose a lot of heat out the bottom.
Start small, say a one night camp whereby if it really does go to shit you have the option to just pack up and go home, and work your way up from there once you get more familiar with your camping gear and sleeping outside.
In terms of gear, a foam rollmat is not the comfiest thing in the world, but they are cheap and most importantly decently warm. I always take one with me when I camp and use it as an underlay for my inflatable mat or a seat if I am hiking and the ground is wet/frozen. This setup, albeit with a decent sleeping bag, has seen me through all seasons in the UK.
Decathlon is probably alright for a cheap tent. Cannot speak to good cheap tents as I always used a tarp and bivvy as my budget camp setup. If you are willing to spend a little more, you can get a Naturehike, OEX, Vango or similar of a very respectable quality for around £100. This is a tent that will last you a long time, without breaking the bank like some of the more premium brands.
Just buy any sleeping bag with a suitable temperature rating, probably a 3-season or 4-season that will take you down to -5 degrees. Cheap sleeping bags generally will keep you warm, however they will be bulky and weigh substantially more than an expensive down bag. Packability and weight are the sacrifices you make when getting started out with entry level gear.
I think a good first step might be getting down to a proper camping / outdoors store near you (Go Outdoors, Cotswolds, independent ones etc.) and having a bit of a chat with the staff to see what they have available; if you really baulk at the price at least you will have a few products recommended that you can shop around online or find alternatives for.
