Not done Tonbridge half but have done Tunbridge Wells half which goes out to Penshurst before looping back to TW. Quite lumpy with a big uphill at Spring Hill to Fordcombe before hitting the main road back to TW.
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Have done that a few times also, the long drag is a killer, but its virtually all downhill after that. One year we started and it was snowing and -5ish, bloody freezing so wore a long sleeve “tshirt” rather than vest and nearly stripped off half way 
we were held in pens freezing for about 30mintues before the start due to the weather!
oh and the timing chips were in the numbers and failed (probably due to weather also) so they did clock time rather than chip time and I went 1:45:30ish, and missed my sub 1:45! It took me a good 2 minutes to cross the start line and I’d paced it to perfection! gutted as if I’d have known I could have gone faster last mile but was being cautious as I knew i had my time…or not 
I think TW was the last time I went sub-2 on a half
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always did well there, maybe as it was right at end of XC season so I’d been running lots.