Bank has Blocked me from buying Bitcoin

My bank blocks me from buying BTC directly but in the past I got round this by buying BTC coupons by bank transfer and then redeeming them to my BTC wallet. Unfortunately the company (Coincoupon) I bought the vouchers from is not currently trading. Does anyone know another company I can use to buy BTC coupons using bank transfer (NOT CREDIT OR DEBIT CARD)? I'm based in the UK.