A TOWN centre drunk who groped a 12-year-old girl after suggesting she and a 13-year-old pal join him for a threesome has been jailed for 21 months.

And Kevin Wolton, 33, will also have to register as a sex offender for ten years after a jury found him guilty of carrying out the sex attack.

The dad, who has a long history of crime and is currently serving a jail sentence, had been drinking before he approached the children.

And the youngsters only got away when a plucky homeless man stepped in and pushed the pervert off them, telling them to make a run for it.

A jury at Swindon Crown Court heard that the two girls had been in the town centre with an older sister and her boyfriend on Saturday, November 9, 2014.

But after getting separated from them the young girls found themselves wandering around looking for the older couple.

At about 6.30pm they were walking away from the fountain at the bottom of Regent Street when Wolton came up to them outside Primark.

The alcoholic suggested a threesome and asked them to come back to his place, the court was told, before putting his hand down the back of the younger child's trousers.

In a video interview the 12-year-old told police: "He said 'Can I take you back to my place?' and my friend said 'No' and I said 'No' and we started walking away.

"And he says 'Oh, please' so then we stopped and he puts his arm round me, and my friend says 'Get off of her', and I said 'Can you get off of me' and then he started putting his hand down my trousers.

"Then this homeless man sees him doing it and he got up and pushed him away from me and then me and my friend both started to run."

As the Good Samaritan stepped in she said she heard him refer to their attacker as 'Gypsy Kev', a nickname of Wolton.

The jury was told a pub boss had told the police that Wolton had a little song he sang with the words: 'I'm Gypsy Kev, I'll do what I want'.

After fleeing the attacker the girls were still stranded in the town and a little later, as they passed Yates Wine Lodge, they saw the attacker again.

One of them took some mobile phone footage of him which was shown to the jury.

Wolton said he was disgusted at the suggestion he had carried out the attack saying if he had seen someone else doing it he would have stepped in to help the girls.

"It takes someone with a sick mind to do something like that and that is not me. To go up to a little girl and touch them and it is not me," he said.

At the time of the offences he said he was drinking in the town centre, which he had been doing since he was 17, and not working.

Wolton was jailed for two years in April last year after he failed to comply with the conditions of four suspended sentences.

The last of them was imposed after he admitted supplying heroin to an undercover police officer in the town centre.

But soon after he was freed he was caught with morphine and three weeks after the sex offences he was involved in a 'despicable' public order offence in the town centre.

He has also been put under an ASBO banning him the town centre in a bid to curb the activities of street drinkers.