Do things like, instead of chopping up fruit, put whole apples on the ground, birds like Blackbirds will take a while to work their way through those. You could try stringing up some peanuts, so the Blue tits have to work a little to get the nuts. Also make up some large fat balls with seeds and nuts in them, they will also last longer. You can buy seed sticks which will last longer too. A friend of mine has had some success using a chicken house style bird feeder. It's a big hopper that she fills with seed, it trickles down as the birds eat the seed in the tray at the bottom. She says it can last for several weeks before it needs filing. People might say this will encourage rats, but rats are going to eat any seed on the ground any way. I would never say, don't feed the birds. Feed them as long as you can, leave as much food as you can and they will move on when the food runs out. But you may well be able to leave enough treats in your garden to keep them interested during February. Good luck. It's nice to see that people care about our feathered friends. They need all the help they can get.