That happens to people all the time Forehead - have a google for "carb creep" to keep you on the straight and narrow.
TheRealMrsHannigan you'll want a good range of protein you can snack on easily so stuff like sliced ham (check the carb content - avoid honey roasted or breaded), smoked salmon, tuna, sardines, smoked mackerel, cheese (don't go mad on this), lots of eggs (it's a good idea to keep some hard boiled in the fridge). You'll also want things like chicken breast, fish and steak to have for dinner - I recommend spoiling yourself with the good stuff at the beginning to help yourself adjust to the lack of carbs.
Butter from grass fed cows such as Kerrygold and cream for your tea/coffee. Olive oil for salads. Lard, ghee or goose fat for cooking (you shouldn't cook with olive oil and vegetable oils are really bad for you).
Lots of vegetables -
The following have less than 1g of carbs per 100g
Spinach for salads
Curly kale (wonderful fried until crispy)
Spring greens
Mushrooms
the following all have 2-3g of carbs per 100g:
Broccoli
Courgettes
Avocados
Cucumber
Aubergine
Cauliflower - frozen will do for cauli mash, fresh for cauli rice
Celeriac - good for chips, crisps and mash
Babycorn (but definitely not sweetcorn which is high carb)
Bamboo shoots
That won't be a comprehensive list of low carb veg but it's a good start - look up anything else online. Be very careful with root veg - some of it is eye wateringly high in carbs. Onions and garlic are a little on the high side but fine in small quantities.