I was in wilkies and picked up a pilsner kit and pressure barrel which I thought I could ferment in. I like the barrel, is there any chance I can ferment some lager in there?
You'd be better off fermenting in a bucket, then transferring to the barrel. Fermentation leaves behind a lot of gunk that you'd have a job cleaning out of the barrel.
In theory you could ferment in the PB however you'd be better off spending another few quid on a bucket then transferring to the PB. It's up to you but I'd be on my way back to Wilkos.
I secondary ferment in a barrel and then use a bottling wand directly on the tap. I drilled the centre out of the cap for an air lock, works great and secondary fermentation has improved my brews no end.