英国留学时写假条，你可以遵循以下格式和步骤：

格式

To：写上收件人的姓名和职位。

From：写上请假人的姓名和职位。

Date：写上写假条的日期。

Subject：写上请假字样。

内容

开门见山，有礼貌地提出请假请求。

明确请假的日期，并说明请假的原因。

尽可能表示对由此带来的不便表示歉意。

示例

```

To: [Manager's Name], Manager

From: [Your Name], [Your Department]

Date: [Today's Date]

Subject: Request for Leave

Dear [Manager's Name],

I am writing to request leave from [Date of Leave] to [Date of Return] due to [Personal/Medical Reason]. I have attached a medical certificate to support my leave request.

I understand the importance of my duties during my absence and I will ensure that all necessary tasks are completed before my leave.

Please let me know if any arrangements need to be made to cover my responsibilities during this time.

Thank you for your understanding.

Sincerely,

[Your Name]

```

请根据实际情况调整上述模板中的内容。记得在提交前检查语法和拼写错误，保持礼貌和专业的语气。