Father’s Day may still be marked with cards, chocolates and novelty gifts, but some retailers and families say the tradition of buying presents is beginning to lose its appeal as the cost of living continues to bite.Jim Cox, who has worked in the gift industry for more than 30 years and runs Stay Lucky gift shop in Southsea, says spending has been noticeably lower this year.“It’s picked up a bit this week, but probably not as much as I’d expect,…