OK, if front suspension is not a must have and if you have a decent
Halfords, look at the Carrera Subways. Sooner or later, they will be on offer for £300 or less - especially with a bank holiday weekend coming up
I'd say a Sirrus is ok for very light off road use, like a towpath/park path, but not for bounding through woods and rough stuff. It really is more of a flatbar road bike on 28mm tyres
See what the suggested bike shops have for your budget - Specialized, Trek, Giant, Dawes, Felt etc all make decent rigid fork hybrid bikes for under £400. Also, Pinnacle from
Evans - there's one in Hendon, or lots in London