Free Traffic Legal Advice

Hi all,
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I've been given 2 PCNs for 'Failing to comply with prohibition on certain types of vehicle; goods vehicle exceeding max gross weight indciated', which is contravention code 52g.
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I saw the height sign but didn't see a weight one or even knew the weight of the hired vehicle. So I drove through Rotherhite tunnel in both directions without realising my error, all in the aid of helping a friend move house, who can't drive. So not only did I lose a days worth of work for being kind, I have two hefty charges to my name, that I can ill afford.
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The vehicle in question was a hired Ford Transit van.
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Both PCN's were 'passed' onto me from the hire firm, who informed me that the PCNs would be on their way.
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My question is are the PCNs valid if they've spelt my name wrong? They had the correct correspondence address.
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eg if the name on the driver's licence is

John Alexander D Smith

they have addressed the PCN to:

Mr Johnlexander D Smith

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Kind regards,
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T.
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Hi cp8759,

well don't I feel the fool now  . Sorry for wasting any bodies time. After waiting 5 days without reply, I [now knowingly incorrectly] presumed that there was no option for me. Also, when I went to the TfL website, the fine they wanted me to pay was showing up at £90 (so £180 collectively), which if I wasn't getting any advice from the ftla website, I thought was a painful half way house to accept. Even then, my 14 day period to contest the charge or pay less ended 11th and nobody had replied to the message.

Anyway, thank you regardless for your attention to the matter. Should I be in a similar scenario I shall definitely wait until the 14th day to pay!

Best wishes,

Toby