Editor's note: Raffaello Pantucci is an associate fellow at the International Centre for the Study of Radicalisation (ICSR) and the author of the forthcoming "We Love Death As You Love Life: Britain's Suburban Mujahedeen" (Hurst/Columbia University Press).
By Raffaello Pantucci, Special for CNN
Friday's conviction of Shabaaz Hussain, a former British teaching assistant for donating thousands to Al Shabaab is just the latest reason the Somali terrorist group is increasingly a priority for British security services.
With news stories of somewhere in the region of 50 British passport holders fighting alongside Al Shabaab, British officials are vigilant to the potential for terrorist plots that might emanate from Somalia in the future.The security of the region was in the spotlight last month at an international conference that drew top government officials from around the world.
It came on the heels of Al Shabaab's announcement that it has officially joined the family of organizations under the al Qaeda banner.
The UK-Somalia terrorist connection is not a particularly new one.
As early as 2005 there was evidence that British citizens were going over to connect with Islamist networks in the country, and that same year, two radicalized Somalis living in the United Kingdom were involved in the failed July 21 bombing attempt on London's public transportation system.
In the wake of the Ethiopian invasion of Somalia in December 2006, there was a surge of young Somali expatriates rallying to the nationalist flag, something that was clearly in evidence in the diaspora community.
In 2007 came the first confirmed British suicide bomber in Somalia.
But more recently it has become clear that preachers who were formerly based in London have now taken on important roles in Al Shabaab in Somalia. British-sounding voices have started to appear with greater frequency in Al Shabaab videos, and the government prosecuted - albeit unsuccessfully - a pair of Somalis living in Leicester who it was believed were involved in running Al Shabaab's website.
Last month it was revealed that a longstanding jihadist with family in the United Kingdom was killed by a drone strike in Somalia.
And another Brit is currently on trial in Kenya on charges of being involved in a plot to carry out bombings in that country.
In that case, British security concerns come clearly into focus.
Jermaine Grant is a former inmate of Feltham Young Offenders Institution, the same prison that U.S. "shoe bomber" Richard Reid was allegedly radicalized in, and where July 21 attack leader Muktar Said Ibrahim did time. Grant is accused of having connected with Al Shabaab and then being dispatched as part of a cell to carry out attacks in Mombasa.
This is not the first time that Al Shabaab has been connected to terrorist plots outside Somalia's borders. The attack during the World Cup final in Kampala that killed more than 70 was directed by the group, and links have been traced back to the group in connection with disrupted attacks in Australia and Denmark.
In September 2009, a cell including at least one Somali-Dane was connected to a plot to carry out an attack in Kenya while U.S. Secretary of State Hilary Clinton was visiting.
And throughout all of this, authorities say they continue to see small groups of young British men trying to connect with the organization in Somalia. A pair from Cardiff was turned back last year, officials said, while three Bangladeshi-Brits stopped by Kenyan authorities were allegedly being sent money by Shabaaz Hussain of East London.
The evidence indicates it is not a mono-ethnic community of Somalis that is being drawn back, but rather a diverse group that reflects every aspect of the British Muslim community.
Preachers and websites from the United Kingdom are providing fundraising and ideological cover, individuals are sneaking over to join the fighting, and suicide bombers and now British citizens are embroiled in plots outside Somalia.
It is a repetition of a pattern already seen in Afghanistan that culminated in the London bomb attacks of July 7, 2005. The clear concern is that a similar trend is playing out in connection with Somalia, involving a group that has now been welcomed into the al Qaeda fold and therefore sees the world, and not simply Somalia, as its battlefield.
The difference is that, hopefully, the lesson has been learned from Afghanistan, and the West is unlikely to leap into large-scale military action.
The fact that the connection is on people's radars and the group has so far restricted itself somewhat in what it has done abroad is a positive sign, but recently the group seems to have stepped up its external operations and stories of recruitment and foreign fighters are becoming more frequent.
The recent London conference on Somalia highlights the United Kingdom's key role in rebuilding that country - exactly the opposite of what Al Shabaab wants - but Britain's problem is that it has also played a key role on the supply side for the terrorist network's development. That took place during a time when Britain was investing untold millions of pounds into counter-radicalization programs.
The lesson appears to be clear: the West has still not figured out domestic counter-radicalization and the British-Somali connection is one that needs to be watched very carefully. Large-scale invasion of Somalia would be counterproductive in terms of reducing the threat to the United Kingdom, as it would only anger the group in Somalia more, as well as feed the underlying narrative that the West is at war with Islam.
But, in any case, Al Shabaab's connection with al Qaeda now means the United Kingdom is seen as an active target.