I agree with Haworthia, possibly H. attenuata. I can't tell what the flowers look like. This is the flower from my plant.

Hello, sorry can't ID as I don't grow these cacti. EL gives sound info above. As the first cactus is a tall one as opposed to a barrel shaped one, could I suggest that the best mix for both it and the other, would be a mix of thirds using c/smix, perlite and horticultural/alpine gravel. You can get small bags of each of these from B & Q for around £3 each. Make sure you either wash the perlite thoroughly in a sieve or just seive it downwind, don't breath the dust in. B&Q perlite is rather dusty, mine is, so there is a lot of waste, just use the largest particles you gain from using your very best kitchen seive! I've also used Wilko perlite, that wasn't quite as bad. Wilko may not sell it now it's Nov, B&Q or garden centres may be a better bet for all the ingredients at this time of the year. The gravel will give the plants much more stability, especially the tall one. Don't get vermiculite if no perlite, it's too water retentive. Aquarium gravel or chicken grit with no shell can also substitute for the hort/alpine gravel. Repotting into a better mix will get rid of any bugs that you think you may have there and it will also solve the problem that you almost certainly would be asking us about in the not to distant future "why are my cacti dying?"... which would be due to the wrong soil they were sold in! So, to prevent that from happening you need to make sure all the old mix is removed, use a chopstick, pencil or similar to get rid of it all. If it won't come if with poking and shaking, swish in water, keep bases of plants dry though, let the roots air dry on kitchen paper, plant when dry. Hold the cactus in a wrap of newspaper or bubble wrap to protect your hands. Moisten the mix and replant, not soaking wet, just moist and crumbly. Won't need much water anyway now weather is colder. Shout if you need any more help. Gill

1. Looks like Crassula ovata aka: Jade. I also see Senecio jacobsenii for some reason. Could you take it out of the pot and take another pic:)? 2. Mammillaria what species I gave no clue. For some reason when it comes to finding the species of a Mammillaria I have zero patience;). 3. Can't really tell. Pretty young still. Maybe a Trichocereus:). 4. Looks like Opuntia monacantha monstrose:). For all your plants it's pretty much the same. Use a gritty mix since it's so rainy where you live. I would use a mix with zero organic material. Keeping in a greenhouse would be good. Make sure there is good airflow in the greenhouse:). If you are able to keep dry I would water them once every 2 weeks. The jade looking plant maybe once a week. If any of the plants are in lots of humidity you may have to adjust. Make sure the mix is dry before you water again. Check almost all the way to the bottom of the pot. Not just the top layer. You can use a little wooden skewer. Push the skewer down to the bottom and let sit for a min. When you bring it up and the wood is damp. No need to water:). Goodluck:) Oh ya make sure the pots have drainage holes:).

Thanks to all that have helped us identify this succulent. My mother has had this plant for several years and she said no flowers ever bloomed. My Aunt lives at sea level, her "flapjack plant" is very green, and not in full sun. Both plants are in pots, maybe one day we will transfer to the earth. She brought them from the island of Molokai many years ago on her annual Memorial Day visit. There is a rare Hawaiian Portaluca plant similar in leaves, but it grows quite tall, and blooms yellow flowers. These plants seem to grow in clusters and are so unique, each time I visit, I sit and just wonder about its history.