welcome first off,
OK so your bottom line is that you wish to build some muscle/ so its not just that you want to gain weight,correct? like the guys said hit the gym,or at least get access to some kind of weight training equipment, second have someone help you who knows the proper form and exercises for your particular needs,3rd and probably most important is the food you eat and the amount, figure out your needs per muscle gain or just weight gain, and we all can lend our support in one way or another, oh p.s. i love that stone weight you use over the pond..