My transcription from YouTube. I have marked several doubtful words with (?).

FERTILISING LIZA
As recorded by Allan Smethurst, “The Singing Postman,” 1977

Now I’m in love with a pretty little girl called Liza,
But someone else, I think, has fertilised her,
As some young lucky devil just had his evil way.
To think my Liza liked him but now she’s got to pay.
She should have been more careful while a-romping through the hay.
Somebody’s gone and fertilised my Liza.

I lay awake at night and how I worry
Why my poor Liza was in such a hurry.
If she’d ’a’ waited for a while, we could ’a’ married more in style.
I don’t care what they mean when they say just what they’ve seen.
Some people like to think she’s been a naughty gal, it seems.
Somebody’s gone and fertilised my Liza.

It could have been young George the poacher,
But I think he’s too shy to approach her.
It could have been old Sule(?) who keeps that corner shop.
He paces(?) for the locals and his bus’ness never stops.
And tension(?) ladders(?) are the only thing he had in stock.
Somebody’s gone and fertilised my Liza.

I thought my dreams of love lie ’neath the willow,
But what a funny place she keeps the pillow!
I’ll take my Liza back ’cause I love her for all that.
There’s no way I’ll desert her; I couldn’t bear to hurt her.
She --(?) for me, you see, ’cause she’s bouncing on my knee
Somebody’s gone and fertilised my Liza.

The Vikings long ago came to the village
To do their window shopping and to pillage.
We’ve heard that ancient saying to wait while may(?) doubt(?)
The Vikings thought that any time was time to cast a clout,
But that was back in hist’ry but there’s still a lot about.
Somebody’s gone and fertilised my Liza.

So now I’m at the home anticipating,
But George, Still(?), Dave and Slave(?) are waiting.
There’s lots of neighbours asking just who that dad will be,
Whilst I am left to wonder if the baby looks like me.
The nurse calls in and brings them out; there’s one and two and three.
Somebody sure did fertilise my Liza!
Somebody sure did fertilise my Liza!
Cheerio!