http://www.telegraph.co.uk/news/worldnews/islamic-state/11455602/Oil-middleman-between-Syria-and-Isil-is-new-target-for-EU-sanctions.html
Below some ridiculous and hollow claims that anyone can easily refute:

„the rise of the jihadist movement [ISIL] has served Mr Assad’s interests by allowing him to pose as an essential bulwark against Islamist terrorism.“
Wrong: Before and parallel to ISIL there were and are jihadist movement that are hardly less sectarian and radical: The Nusra Front, The Islamic Front…
https://radioyaran.com/2014/09/11/the-vetted-moderate-rebels-of-the-free-syrian-army-who-and-where-are-they/

„Isil fighters captured the oilfields of eastern Syria in 2013. Since then, the regime is believed to have funded the jihadists by purchasing oil from Isil.“
Ah…so, the author and his sources do not KNOW anything, they just speculate.

„the regime is understood to be running some oil and gas installations jointly with the terrorist movement.“
Really? Then, why is the „regime“ vehemently fighting ISIL at the Jadal gas fields in eastern Homs province? And more important: Why is ISIL attacking it´s „customer“ and „oil and gas provider“ if they are maintaining a „joint venture“?

„Philip Hammond, the Foreign Secretary…added: „…yet another indication that Assad’s ‚war‘ on Isil is a sham and that he supports them financially.““
The Syrian Army suffered some of its highest casualties in major battles against ISIL:

a) at the Tabqa military airport in Raqqa province
For months Tabqa was besieged and under continuous attacks by ISIL:
http://en.wikipedia.org/wiki/Battle_of_Al-Tabqa_air_base
In addition to the hundreds of soldiers killed in battle, another 200 army soldiers were taken captive and executed:
„Following the capture of Tabqa air base a number of images and videos have been posted online showing around 200+ men, reportedly captured soldiers, being marched out into the desert and executed.“
https://bellingcat.checkdesk.org/en/story/60

b) at the Jadal or „Al Shaer“ gas fields:
„The victorious Islamic State summarily executed an estimated 300 captured regime soldiers and civilian employees“
http://syriadirect.org/main/30-reports/1719-prelude-to-a-massacre-the-downfall-of-a-raqqa

c) at the Division 17 and Brigade 93 in Raqqa province:
„Hundreds of Syrian army soldiers scattered to the safety of nearby villages still opposed to the Islamic State, or fled to the Syrian army’s 93rd Brigade, roughly 45km northwest of Division 17. An estimated 50 caught inside Division 17 were quickly killed, their heads removed and rammed on metal pikes lining the streets and parks of A-Raqqa city. More than 85 Syrian army soldiers died during the Islamic State’s final operation to capture Division 17“
http://syriadirect.org/main/30-reports/1719-prelude-to-a-massacre-the-downfall-of-a-raqqa

d) at Regiment 121 in al Hasakah province:
„in Al-Hasakah province, the Islamic State commander Umar Al-Shishani led a near simultaneous assault against Regiment 121..The Islamic State claims to have killed more than 100 soldiers at Regiment 121“
http://syriadirect.org/main/30-reports/1719-prelude-to-a-massacre-the-downfall-of-a-raqqa

As a matter of fact and for many months the Syrian Army has deployed two of its most experienced commanders to fight ISIL: In Eastern Homs it was until recently Colonel Suhayl al Hassan, the commander of the special forces unit „The Tiger forces“. During the most crucial operations he was assisted by another special forces unit called the „Desert Falcons“.
In Deir al Zour the government forces are led by nobody less than Major General Issam Zhahreddine.
Despite the above mentioned setbacks the Syrian Army has inflicted heavy losses on ISIL, among them:
„On 28 August, Syrian fighter jets launched a precise attack on an IS HQ in the city of Mohasan, during a meeting between military leaders and sharia judges. The attack resulted in the death of most leaders inside (numbering six), while others were wounded.^[20][50] Another airstrike occurred the same day against an IS camp near Baath Dam, killing and wounding dozens of insurgents“
http://en.wikipedia.org/wiki/2014_Eastern_Syria_offensive

And just today the following was reported:
„In Hama province, meanwhile, government forces conducted air strikes on an IS convoy, killing 26 jihadists, including a senior local commander, the Syrian Observatory for Human rights said.“
http://www.al-monitor.com/pulse/contents/afp/2015/03/syria-conflict-is-assyrian.html

So, the only „sham“ and the true shame, Mr. Hammond, is your alarming lack of knowledge with regards to an army that – contrary to yours, the UKs – is fighting the real war on terror, while paying a high price in human blood.