Income Portfolio: is it feasible?

You could put together a portfolio of Investment Trusts choosing ones which yield 4%-5%.
A number of investment trusts have increased their dividends every year for 30 plus years. City Of London investment trust yields about 4% and has increased their dividend for the past 49 years. Of course you cannot predict the future but another advantage of investment trusts is the ability to build up a reserve fund, which they can use to boost the dividend in lean years.

If you don't have much experience with shares investment trusts are ideal to get started with.

Some of my favourite investment trusts are
City Of London
Perpetual Income & Growth

Scottish American Investment Company - Global income

Schroders Oriental Income - Asia
Henderson Far East Income - Asia

i also quite like the CF Woodford Equity Income fund which is a fund and not an investment trust.

Very true. Nothing is guaranteed with equity investments. But I would think some of the more established equity income investment trusts such as City Of London/Scottish American are likely to be able to continue increasing their dividend or at the least maintain it. I would think (hope!!!) that their investment managers are keeping a close eye on the dividend cover on the companies in which they are invested.