As others have posted, pensions are only lost if an offence is especially grave, whatever anybodies personal judgement, this one probably won't qualify. That may not stop the aithorities having a go, but then they will fall foul of the UK laws preventing cruel and/or excessive punishments/tariffs.
Dude I helped defend (found not guilty BTW) was charged with GBH and was looking at two years. He explicitly asked this questions of his barrister (while I was there, so not hearsay) and was told, not a chance you will lose it.