How to stop cramp

I swear by about 250-500ml of hot electrolyte drink at the end of the day. Horley's Replace does the job and the powder is good value. I never have stiff legs or cramp when I take this.

what would i give to solve this problem. 6 hours or so in and i go through some serious bouts of cramp in both thighs. Cramp stop helps as does panadol at the same time. Horleys replace is part of the diet but i have resigned myself to paying the price. I can get a bit vocal when it strikes and during the roar last year had a stag getting quite excited about 40 metres away just below sparrowhawk biv in the Ruahines as i lay on the track groaning in pain :)