JSFiddle - React, Tailwind, and code Playground

HTML

<label>
    <input type="radio" value="false" name="voucher_amount" id="voucher_amount_false" />
    <input type="input" id="other_amount" name="other_amount" class="form-text"/>
</label>


<table class="datatable" border="0" cellpadding="0" cellspacing="0">          
<tr class="gift-option">
    <td><label class="gift-option-label" for="membership_62">Advance UK</label></td>
    <td>
        <input class="membership" id="membership_62" type="radio" name="membership_type" value="62">
        <label for="membership_62">£15</label>
    </td>
</tr>
<tr class="gift-option">
    <td><label class="gift-option-label" for="membership_73">Advance UK Senior</label></td>
    <td>
        <input class="membership" id="membership_73" type="radio" name="membership_type" value="73">
        <label for="membership_73">£12.50</label>
    </td>
</tr>
                <tr class="gift-option">
    <td><label class="gift-option-label" for="membership_44">Advance Europe</label></td>
    <td>
        <input class="membership" id="membership_44" type="radio" name="membership_type" value="44">
        <label for="membership_44">£17</label>
    </td>
</tr>
                <tr class="gift-option">
    <td><label class="gift-option-label" for="membership_9">Advance Outside Europe</label></td>
    <td>
        <input class="membership" id="membership_9" type="radio" name="membership_type" value="9">
        <label for="membership_9">£21</label>
    </td>
</tr>
                <tr class="gift-option">
    <td><label class="gift-option-label" for="membership_5">Priority Membership</label></td>
    <td>
        <input class="membership" id="membership_5" type="radio" name="membership_type" value="5">
        <label for="membership_5">£65</label>
    </td>
</tr>
                <tr class="gift-option">
    <td><label class="gift-option-label" for="membership_149">Priority Plus</label></td>
    <td>
        <input class="membership" id="membership_149" type="radio" name="membership_type"...

JavaScript

$('#other_amount').on("keyup", function() {
    $('#voucher_amount_false').prop("checked", true);
});

$('.membership').on("change", function() {
    var val = $(this).val();
    // Disable both buttons
    $('#membership_method1, #membership_method2').prop("disabled", false);
    if(val == 62 || val == 73 || val == 44 || val ==9) {
        $('#membership_method2').prop("disabled", true);
    }
});