Tunisia's tourism and transport ministers and speaker of parliament held meetings at the Foreign Office and with the speaker of Britain's House of Commons while offering condolences to the families of victims, 30 of whom were British.
Meanwhile, Foreign Secretary Philip Hammond met Tunisian Prime Minister Habib Essid in Brussels, where EU ministers promised to boost political and economist support for Tunisia.
Britain advised its nationals to leave Tunisia and warned against all but essential travel to the country a fortnight after last month's attack by a jihadist gunman. It warned local authorities could not provide "adequate protection."
Members of the delegation said the travel alert threatens to have a powerful impact on the economy in Tunisia, where tourism accounts for between seven and eight percent of gross domestic product and 400,000 direct and indirect jobs.
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Tourism Minister Selma Elloumi Rekik said that they had reassured the Foreign Office that security measures had been reinforced significantly since the attack took place.
"The meeting was very positive, we had lots of discussion about the security situation, the economic situation, the situation for tourists in Tunisia," she told AFP.
"But what we heard today and earlier is reassuring us it's an immediate reaction which has been taken under emotion," he added.
"Tunisia does not deserve to be sanctioned. It has done everything and takes all the different measures" necessary to ensure security.
Zohra Driss, the owner of the Imperial Marhaba hotel where the attack took place and a lawmaker, said that continuing to warn travellers against visiting Tunisia would cause "the biggest economic and social crisis (it) has ever known.
"It would plunge Tunisia into instability and unemployment which will contribute to radical Islamism," she added.