. My old bike has long gone. I live about 5miles from work and have just acquired a tidy, roadworthy Raleigh Twenty. How easy would it be to start riding this on my commute after a good few years away from cycling. Don't want to buy a decent bike as if I don't end up liking it(riding to work) I dont want to have an expensive bike going to waste.
A Raleigh Twenty IS a decent bike, like pretty much all Raleighs of that era are decent bikes. There's nothing really wrong with them in engineering terms, but the drawbacks of small wheel "shopper" bikes are they don't deal so well with bumps and potholes and they are fairly hard work pedalling, along with having a riding position that will feel cramped to a larger man.
If you decide to keep commuting you absolutely don't need to waste a load of money buying an "expensive" i.e. new quality bike, you just need something useable with bigger diameter wheels and maybe more suitable gearing. A Twenty is better suited to local shopping than commuting, that's all. Loads of cyclists get fixated on the idea that if they need another bike, that is has to be new and they have to spend £3/4/500 or more to get anything worth riding. This is complete nonsense; a cheap secondhand hybrid or even a fully rigid frame mountain bike is perfectly adequate, so long as it is fitted with sensibly stout p*ncture-resistant tyres not off-road knobblys. I own 3 old Raleighs I bought secondhand, the most expensive one was only £20, and they are all cracking bikes. My favourite one, a Reynolds-framed 1995 Pioneer hybrid, would make a perfect machine for your commute, although I keep mine as my "best" bike and treat it with a lot of care.