I have accidentally brought a load of fenugreek seeds, as apposed to leaves, and wonder if I can use them as a substitute.
if not, what any ideas for what I can do with them before they go in the bin?
Fenugreek seeds are intensely aromatic and go quite nicely in curries, and any dish where such a flavour is required. In the middle-east they use it quite a lot, often as a condiment. Highly used in spice rubs, pickles, marinades, anything where a strong spice flavour is required and often in puddings as an aromatic like nutmeg is used in English cooking.
The leaves have a similar flavour, but not quite the same, you could use the seeds in their place adding them in to the spice mix if there is one, but the leaves I prefer personally. The flavour of methi leaves in thepla or in curry is wonderful in my opinion.
A great way to use fenugreek seeds is as one ingredient in creating your own 5-spice (Panch Phoron) powder. Then, you can use in stir-fry and/or sauces. I prefer the flavor when cooked some, but it may work as a chicken marinade as well.