Fuller, 27, contested two BTCC events in 2012 with Team Hard in a Honda Civic, and another pair of rounds in 2013 with the squad’s Vauxhall Insignia.
He then contested the Volkswagen Racing Cup for 2014 and 2015, and was on the grid for a couple of TCR UK rounds in 2018.
“Unfortunately, there is still some damage and residual inflammation of my heart after falling ill at the start of February, said Bushell.
“It means that I am unable to hold a race licence, but more importantly, I’m not physically able to race at the moment and I have to put my health first.
“I will have to postpone my return the BTCC grid once again and focus on getting back to full health – I wish the team and Howard all the best for the start of the season.”
Our first outing in the championship was way back in 2012 with Team Hard in the iconic green and pink Honda Civic – how things have grown!
Fuller will join Jack Goff and Nic Hamilton (also in VWs) and Carl Boardley (BMW 125i M Sport) in the Hard line-up, and will take to the track for the first time in testing next week at the Guadix circuit near Granada in Spain.