Ingredient availability changes as the year goes on. This means things that were easy to get during the summer wont be so readily available in the autumn or winter months. The kinds of ingredients that are easily available or "in season" now is :-
Wild mushrooms- these are found in wooded areas but some are poisonous so you have to be sure you pick the safe to eat ones.
Duck- more specifically wild duck. The seasons are changing and wild ducks will start to migrate south so the availabilty of them won't last for long.
Cabbage- this is a good tasty vegetable which can be used in a variety of dishes.
Potatoes- these are a staple for most households in britain as they are fairly cheap and can be used in so many dishes.
Venison- this meat has risen in popularity due to its increase in availabilty and its rich gamey flavour.
2.
A 2 course meal using these ingrients would be :-
Starter- Pan fried duck breast with wild mushrooms risotto(sounds like a lot but the portion size would be small to accomodate the dish being a starter)
Main course- Venison casserole
3.
The local availability of these ingredients is pretty good if you are willing to travel a short distance.
http://www.farmshop.uk.com/local-area/scotland/renfrewshire/inverclyde/
here are a few links to websites of local suppliers :-
http://www.visitscotland.com/info/food-drink/greenock-farmers-market-p301761
http://www.auchengree.co.uk/
http://www.edenmill.co.uk/farm-shop