What can I be putting in now?

Nothing, as far as I know once the garlic and winter onions are in.

Everyone is just getting the soil ready for spring, as and when the conditions allow.
So keep up the good work and you'll be flying by the time the warmer weather comes

I don't think anything will germinate at near to zero soil temps, even the garlic and onions are bulbs so don't need to germinate.
Rhubarb? fruit bushes and trees? unless you have a greenhouse or cold frame when you just might grow some of the winter lettuce............. really cant think of anything else

have been looking out for shallots in the shops have I missed them?
havn't grown them for a few years but last year someone told me they pulled some early and used them as spring onions (can't seem to grow them)
marg

Its quite mild up here in Wrexham
I planted some echalote grise shallots in Autumn that seem quite slow in growing, you could try those (if you can get any)
Broad beans (claudia aquadulce)can be overwintered if the weather isnt too cold as well- i know its late but it is very mild for the time of year.