tall fighters

i have a problem fighting tall fighters who can kick resonably well i seem to get caught a lot with a head shots i know i should get in close but as soon as a ref says fight they put their leg up kick in reps its hard to get in close.
any tips how to combat this?

Never move straight toward the opponent. Side step slightly to his weakest side, then attack from there, do not hesitate.
Never move into the 'kill zone' without throwing a technique, strike hard and fast.
And you are right, you have to get inside his reach to negate his ability to kick.
Find some tall sparring partners and practise getting inside their guard.

thanks for the advice i will try it out in training monday