Taxation whilst working in UK and living in Spain

[hbzboy]

Currently commuting at the weekends from UK to Spain obviously paying UK tax. The go to a 3 weeks on and 3 weeks off rota not more than 183 days in Spain still paying tax in the UK. The point is in around a years time I will be 2 weeks in the UK then 3 weeks off in Spain so more than 183. How do I pay my tax? Is it solely in Spain? Any help appreciated

[hbzboy]

Cheers guys will get in touch with meridian.