请英文高手来帮我翻译一下这封信

Question

最近要跟一个英国人经常联系，我看他写的信没什么问题，但是自己英文丢了很多年，怕回信写得不好惹人笑话，一直不回也不礼貌，大家帮我翻译翻译。他叫david，算是我的长辈，我想写的内容是：收到你的来信很高兴，很抱歉一直没给你回信。很感激你们夫妻的邀请，以及在签证方面你给予的耐心帮助，从一应表格的填写到与面试官的预约都是你一手操办，给你添了很多麻烦。再次谢谢，我想我们一家会在英国度过一个愉快的假期。

好像也没什么好说的，就是感谢他。他在上次信中说Do not work to hard or you could be a long time dead.要我不要太努力的工作，否则就要变成一个dull person。我想跟他说我不是一个dull person。

Answer 1

Dear David,
I am very glad to have reaceived your e-mail. I'm sorry that I didn't answer your e-mail in time because I have been kept very busy these days.
In this e-mail of mine, I'd like to say "Thank you very much " to you! It is your invitation that has enabled our trip to Britain. You and your wife have given me so much help. Not only did you tell me how to fill in those forms but also arranged my appointment with the interview officer. We couldn't have had our visas approved without your help. Thank you! Thank you very much! I am sure, with the help of yours, we will have a very good time in Britain.
In your last e-mail you were worried that I would become a dull person. Don't worry! When we meet in Britain, you will find out how cute and interesting I am.
Thank you again! Looking forward to seeing you in Britian!
Yours,
昆明的夏天

Answer 2

Dear David，
I‘m so delight to hear from you.I'm terribly sorry that I haven't replied to you for such a long time.I'd like to show my great thankness to you couple for your invitation.I'm very appreciated that you helped me a lot with my visa with much patience.You helpd me all the way through from the form-filling to make appointment with interviewer.I have made so much trouble to you,please allow me to show my thankness for the second time.I think we will spend a happy vacation in British..

Answer 3

Glad to receive your letter, I'm sorry haven't reply to you. Appreciate your invitation to husband and wife, as well as in the visa you give help and patience, from time to fill in the forms to the interviewer 's appointment is your labors, give you a lot of trouble. Thank you again, I think we will spend a happy holiday in england.

Answer 4

How are you doing David?
I`m delightful to get your letter, sorry for being late to reply you.
Thank you so much for inviting me and assist me on applying visa. I appreciate that you`ve been arranging my affairs since I filled the paper works till made the appointment. Hope it doesn`t bother you too much.

By the way, Chinese are always hard working, but it doesn`t mean we are nerd. :p
You are so nice to me, thank you again, I do believe we will spend a pleasant vacation in British.

Yours,XXX

参考资料：自己写的