I want to invest £25 per month into bitcoin for the next couple of years

[~Money~]

I feel like this is a silly comment. If you are worried about losing money in fees you probably shouldnt buy  or use BTC ever. It has never really been cheap, if your thinking in BTC terms.

Hes a new guy, let him invest how he pleases. You worried about fees? Go to LTC or something. If you want BTC, buying in small amounts over time is the best option. Especially because of it being high right now. This doesnt really show signs of stopping mate. Get over it.

Yes btc  was never that cheap, but it will be better and faster after upcoming forks,
Currently, btc is going to the moon again as it is preparing to start "BTC FUTURE" trading tomorrow in usa,
So the price is too high to invest such low price, i still think altcoins investment is much better now

[FrankNorway]

.... Forgot to mention. There is a whole lot of fake sites offering hosted mining or sky services. I almost lost 2000 to genesismining.org

[CatFur]

It's a good idea!
cons: depending on how you buy your BTC, the current minimum tx fee will be the downside
it would cost you (or seller) significantly high when dealing with low amount transaction
if you can find a way to reduce the fee close to negligible, it would be perfect

Atm I just registered on Coinbase and waiting for verification from there, I thought of buying on monthly basis. Is it a good idea?

Being the investment expert which I'm not I'm going to agree with those suggesting diversification. But definitely not making a loan to make an investment. If I had that kind of money I would be looking into storing some on a regular basis at FreeBitco.in where I can earn some interest [in addition to where ever you're planning to store your bitcoins].