One of the pair was found several hours later tied up and left by a roadside in a bid to make it look like the two men were victims.
Brazen thieves stole a police car and drove it 230 miles before they were stopped by a stinger.
Police are appealing for help in tracing a family of six who are feared to be travelling to Syria.
Slough MP Fiona Mactaggart has donated £14,268 to Comic Relief after thousands of people retweeted her post on social networking site Twitter.
The Labour politician told her followers on Friday that she would donate £1.00 to the Red Nose Day appeal for every retweet the post received by 9pm.
"You have to stick by your word if you take a risk like that," she told ITV London.
Read: More on Labour MP Fiona Mactaggart's donation to Comic Relief.
A politician's "spur of the moment" charity idea left her more than £14,000 down after promising £1 for every retweet she got on Twitter.