as long as you defrost them properly you should be fine boiling them in inch wied slices, make sure they are white right through before you take them out of the water. once cooled you can refreeze them but i prefer not to as they taste 'frozen'when you next defrost them unless you cover them in a sauce or use in a curry . I have sliced fresh chicken, frozen it and boiled from frozen many times, that works well too.

sorry to hear you are being uprooted because of the bedroom tax it is wrong that it is hitting the vulnerable and old the most. you can still grow hrebs like corriander, basil, parsley and chives on window sils, i didn't realise you were in the UK too, one great thing i found out years ago is if you buy a thing of 'growing' lettuce in the supermarket (lidels has some in at present) you can repot it and it will keep growing, you can keep it on your kitchen work top or a cool windowledge and pick just the leaves you want each day or two, put them with some of the herbs and you have a salad!

when i buy chips at the chip shop i find a portion is way too much for me so i freeze half and oven cook them another day, they come out really crispy. also i tend to buy the chips at the chip shop because it saves having loads in the freezer, but i then cook my own chicken or fish and peas to go with them, much cheaper than buying a whole meal from the takeaway!
iceland southern fried chicken portions are just as good as and cheaper than KFC!