ENGLISH WANDERER (0740 653169) is offering walks on a Celtic theme. A seven-night tour through Wales' 'Owain Glyndwr Country' in October costs pounds 323 including accommodation. An independent tour of Offa's Dyke costs pounds 775 for a 14-night walk from St Asaph to Hay-on-Wye. Hotels, meals, luggage and transport are arranged. The company provides marked maps with a route briefing.