I've got a spare NBC suit so that you could practice your NBC drills. You could test your respirator at one of my BBQs. You could also sign out a liferaft and lifejacket to practise your pool drills (handy to have a garden pond for this one). You might be able to download the fitness test beeps at
www.shuttlerun.co.uk. But as you say you are getting older so you might have to buy an exercise bike try
www.argos.co.uk. The list goes on and on, or you may just choose to do it once a year and leave the results to the experts. That would then give you more time to carry out your primary duties and get a life.